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Wikipedia

SIG SG 550

January 13, 2023

The SG 550 is an assault rifle manufactured by Swiss Arms AG (formerly a division of Schweizerische Industrie Gesellschaft, now known as SIG Holding AG) in Switzerland. "SG" is an abbreviation for Sturmgewehr ("assault rifle"). The rifle is based on the earlier 5.56×45mm NATO SIG SG 540.

SG 550
The SIG SG 550, designated Stgw-90 (German) or Fass-90 (French) in the Swiss Army
TypeAssault rifle
Place of originSwitzerland
Service history
In service1990–present
Used bySee Users
Production history
DesignerSchweizerische Industrie Gesellschaft
Designed1970s–1980s
ManufacturerSwiss Arms AG (formerly Schweizerische Industrie Gesellschaft)
Produced1986–present
No. built600,000+
VariantsSee Variants
Specifications
Mass4.1 kg (9.04 lb)
Length1,000 mm (39.4 in) (stock extended)
772 mm (30.4 in) (stock folded)
Barrel length528 mm (20.8 in)
Cartridge
ActionGas operated, rotating bolt
Rate of fire~700 rounds/min
Muzzle velocity911 m/s (2,989 ft/s)
Effective firing range100–400 m sight adjustments
Feed system
SightsRear: rotating diopter drum with tritium night inserts; front: hooded post with folding night post
540 mm (21.3 in) sight radius (SG 550)

History

Development

In 1978, the Swiss armed forces formulated requirements for a successor to the Stgw 57 battle rifle (known commercially as the SG 510) using the 7.5×55mm GP 11 cartridge. Emphasis was placed on modularity; the weapon family was to include several variants of the base design, including a compact carbine that would be issued to rear-echelon and support troops, command staff, vehicle crews, special forces personnel and paratroopers. Another aim was to reduce the overall weight of the rifle while retaining comparable or improved accuracy out to 300 m. The solicitation was narrowed down to two designs: the W+F C42 (developed by the state-owned Waffenfabrik Bern, using both 6.45×48mm and 5.56×45mm cartridges) and the SG 541 (developed by SIG). In 1981, the experimental 6.45mm GP 80 cartridge was rejected in favor of the more conventional 5.6×45mm Gw Pat 90 round (with a 4.1 g, tombac-jacketed, lead core projectile) that is the Swiss equivalent to NATO's standard 5.56×45mm cartridge.

Forerunners of the Sig 550
  •  

    The C42 by Waffenfabrik Bern (here the 6.45mm Rifle version)

  •  

    The C42 by Waffenfabrik Bern (here the 6.45mm Carbine version)

  •  

    Detail of the distinctive integral handguard of the C42

  •  

    Detail of the top-mounted arming lever of the C42

  •  

    The SG 541 (here the 6.45mm Carbine version)

Production

In February 1983, the decision to adopt the SG 541 was publicly announced (the designation of the rifle was changed in October of the following year to SG 550, while the carbine version became known as the SG 551). Production began in 1986 and four years later the rifle was officially accepted into service in 1990, hence the military designation Stgw 90. Over 600,000 rifles have been delivered since then and production for the military has now ceased.[1]

Design details

Operating mechanism

 
SG 550 disassembled into its main constituent groups

The SG 550 is a selective-fire 5.56×45mm NATO assault rifle firing from a closed bolt. It has a gas-actuated piston-driven long-stroke operating system derived from the SIG SG 540 series of rifles, which uses burnt powder gases vented through a port in the barrel to power the weapon's moving parts. Once inside the gas cylinder, propellant gases pass through an L-shaped channel machined in the piston head and are directed forward towards the gas valve. The pressure build-up in front of the piston head pushes the piston and bolt carrier rearward. As the piston is driven back, the gas port and the L-shaped channel move out of alignment, cutting off the supply of gas to the cylinder. Surplus gas and powder residues are evacuated through an exhaust port in the gas cylinder. The manually adjustable gas valve has two settings, one for normal operation, and the second setting for use in the presence of heavy fouling or icing.

The rotary bolt locking mechanism consists of two steel locking lugs that engage locking recesses in the breech, and is identical to that used in the SG 540. A spring-loaded extractor is incorporated into the bolt while a fixed protrusion on one of the receiver's internal guide rails ejects the spent cartridge casings.

Features

 
The rifle controls, including fire selector/safety.

The rifle is hammer-fired and has a trigger mechanism with an ambidextrous safety and fire selector switch that has 4 settings: "S"—safe, "1"—single fire, "3"—3-round burst and "20"—fully automatic fire. The 3-round burst mode "3" and the fully automatic "20" position can be disabled by a rotating safety guard to avert accidentally activating the continuous fire mode. The trigger is enclosed in a pivoting trigger guard which can be folded down to the left or right side allowing for unhindered operation with winter gloves. The trigger pull is approximately 35 N (7.9 lbf)

The firearm is fed by lightweight 20-round box magazines, 30-, 10- and 5-round magazines are also available. The magazines are molded from a translucent polymer and can be locked together using studs in order to facilitate quicker reloading (Jungle style). The empty weight of a 20-round magazine is 95 g (3.4 oz) and 110 g (3.9 oz) for a 30-round magazine.

A bolt hold-open device locks the bolt carrier assembly open after expending the last cartridge from the magazine and is released by lifting the bolt catch lever located on the left side of the receiver. Alternatively, a left-handed shooter may release the bolt by pulling the rubber-coated charging handle to rear a short distance.

The SG 550 has a side-folding skeletonized buttstock (folds to the right side of the receiver) and a lightweight aluminium bipod that folds into grooves in the lower handguard. The hinged stock is firmly locked in the folded position by a socket in the butt which clips into a plastic stud on the handguard; a firm pull will release the stock which is then swung into the closed position and locked by a button catch. A collapsible side-folding stock is also available. The stock, pistol grip, and handguards are made of a high-strength polymer, and are produced in either green or black colour options. The steel receiver housing and several other components are manufactured using stamping and welding; external steel surfaces are finished with a ceramic-reinforced enamel coat known as Ilaflon.[2]

The heavy, cold hammer-forged barrel is screwed into the receiver and is equipped with a slotted "bird cage" type flash suppressor that is also used to launch rifle grenades (using standard, live ammunition) or attach a knife bayonet (the bayonet is supported by a lug located at the base of the gas block). The rifled barrel has 6 right-hand grooves and the Swiss Army specification 254 mm (1:10 in) rifling twist rate is optimized for Swiss military GP 90 ammunition. An export-oriented barrel with a 178 mm (1:7 in) twist rate is also available, designed to stabilize 5.56×45mm NATO rounds with the heavier SS109 and tracer projectiles.

All rifles are test fired for accuracy and function prior to leaving the factory at the manufacturer's underground 300 m test range. Random new rifles out of production were tested on a machine rest. In a 24 single shot string starting with a cold weapon and using GP 90 ammunition, the R50 or 50% windage and elevation dispersion of any individual weapon must have been within an 11 cm (4.3 in) group at 300 m, the 50% windage and elevation dispersion must have averaged 7 cm (2.8 in).[3] The employed circular error probable method cannot be converted and is not comparable to US military methods for determining rifle accuracy. When the R50 results are doubled the hit probability increases to 93.7%.

The gas system's components are made of stainless steel. The barrel, bolt, bolt carrier, and firing pin are all made with steel that has been gas nitrided, hardened and tempered. The bolt and carrier, along with most other components internal to the receiver undergo a phosphating process.

Sights

 
Rotating diopter drum rear sight.
 
Tritium-illuminated night sights.

The SG 550 series rifles have a 540 mm (21.3 in) long sight radius and are equipped with iron sights adjustable for both windage and elevation. The sights are similar to those on some Heckler & Koch weapons, such as the HK G3 or HK MP5. The sights consist of a rear, rotating diopter drum soldered to the receiver and a hooded front post installed in the gas block. The rear sight has an open notch setting marked "1" designed for immediate firing up to 100 m but also contains apertures with settings "2", "3" and "4" corresponding to 200, 300 and 400 m firing ranges. The 400 m setting has a removable iris for sportive shooting. The sights are adjustable via micrometer screws with windage and elevation increments of 0.15 mil (≈0.52 moa), or 15 mm (0.6 in) at 100 m. For night use, the dedicated "1" notch setting in the rear sight drum is provided with two self-luminous tritium-powered inserts fitted laterally on each side of the notch and additionally in a flip-up post attached to the foresight. When firing rifle grenades the front sight hood is aligned with the uppermost edge of the grenade's warhead, this provides an estimated point of impact up to 75 m. The rifle grenades intended for this purpose were FN/Luchaire Type 58-N bullet-though anti-tank grenades.

 
An SG 550 equipped with the Kern 4×24 telescopic sight

For designated marksman use, the SG 550 is equipped with a Kern 4×24 telescopic sight on a quick-detachable mount.[citation needed] The sight weighs 730 g (26 oz) and includes a variety of features, such as STANAG 2324/MIL-STD-1913 compliant mounting components, a Bullet Drop Compensation (BDC) elevation adjustment knob for ranges from 100 to 600 m, a tritium-illuminated reticle that enables target acquisition in low-light conditions and a diopter eyesight correction adjustment. Included with the sight is a lens hood for mounting on the ocular that reduces image quality-impairing stray light and a gray filter for glare reduction.[4] The basic model of this optical sight was already used on the Stgw 57.[5]

The upper receiver can accept quick-detachable rails and adapters used to mount optics (STANAG 2324 compliant). The scope mounting system consists of a centering hole located on the front face of the rear sight assembly and a dovetail-like mounting point at the front end of the receiver. Swiss Arms (respectively Brügger & Thomet) offer several types of quick-release scope mounts and Picatinny rails. A version of the rifle with an integral receiver-mounted Picatinny rail is also offered; in this configuration the weapon is fitted with flip-up emergency battle sights—a rear aperture sight which folds down into a recess in the rail and a folding front blade.

Accessories

 
Swiss soldier with a SG 550 and a GL 5040/5140 grenade launcher
 
Stgw 90 bayonet made by Wenger

Both the rifle and carbine come standard with a spare magazine, sling, cleaning kit and a loading aid for rapid magazine filling.

The full-sized SG 550/551 will accept SIG's 40 mm GL 5040/5140 grenade launcher (Swiss military designation: 40 mm Gewehraufsatz 97), which is mounted under the barrel via an eccentric latch and replaces the lower handguard. The grenade launcher is a single-shot breech-loaded weapon that is supplied with a leaf sight that attaches to the rifle's rear sight base and enables accurate firing out to 200 m. The lightweight aluminium launcher weighs 1.7 kg (3.7 lb) unloaded, and is operated independently of the rifle. It can use a wide array of 40×46mm grenades, including extended range high-pressure types and non-lethal baton or anti-riot projectiles. The compact SG 552/553 can be fitted with smaller GL 5340 underbarrel grenade launcher.

An Stgw 90 bayonet can also be mounted to the rifle. The bayonet has an overall length of 310 mm and a muzzle ring diameter of 22 mm. The 177 mm long blade is single-edged and it has no fuller. The bayonets are manufactured exclusively for the Swiss Army by Victorinox and in the past by Wenger until Victorinox acquired Wenger in 2005. With a proper lug adaptor, the rifle will also accept a NATO-pattern KCB-77 (made originally by Carl Eickhorn of Solingen, West Germany) or the American M9.

Variants

SG 551

 
SG 551 carbine

The SG 551 carbine has a short pattern 363 mm (14.3 in) barrel, gas tube and piston compared to the SG 550. The SG 551 series rifles have a 466 mm (18.3 in) long sight radius. The handguards were also changed and the bipod removed. The SG 551 cannot be used with a bayonet or fire rifle grenades. The SG 551 comes in several specialized variants designed for use with security and special forces. Among those variants are:

  • SG 551-1P police carbine, designed to engage point targets out to 300 m; equipped with a Hensoldt 6x42 BL telescopic sight and detachable cheek riser.
  • SG 551 SWAT carbine, coated with a corrosion-resistant finish and equipped with an optical sight mount used with a wide array of sights, and can also accept mission-critical accessories such as a bipod, laser pointer or tactical light.
  • SG 551 LB carbine with an extended 454 mm (17.9 in) barrel that enables the use of rifle grenades and a bayonet.[1]

SG 552 Commando

 
The compact SG 552 Commando carbine with 30-round magazine

The compact SG 552 Commando (full designation as the 552-2P[6]) carbine was released in July 1998. It has a shorter 226 mm (8.9 in) barrel (with an open, 3-prong flash suppressor) and gas tube, ventilated handguards and a redesigned bolt carrier group that was integrated with the piston rod to form a single moving assembly. The SG 552 series rifles have a 360 mm (14.2 in) long sight radius. The return mechanism has been moved to the rear of the receiver housing and its recoil spring is guided in a way analogous to that of the AK-47: on a steel guide rod (later models feature a polymer guide rod) resting against the lower receiver's rear surface under tension of the compressed recoil spring. Like the SG 550/551, this model can accept rails and accessories enabling the use of optics. A long barrel version of the SG 552 known as the SG 552 LB incorporates a 346 mm (13.6 in) barrel with provision to fire rifle grenades and support a bayonet. The SG 552 models were discontinued in 2008 and replaced by the SG 553. Upgrade part kits are available to convert a SG 552 in to a SG 553.

SG 553

 
SG 553 in the hands of Malaysian Air Force PASKAU commando during LIMA 2009

The SG 553 is an improved version of the SG 552 and was released in 2008. Even though it mostly resembles the SG 552, the SG 553 has one key advantage, the recoil spring is now wrapped around the piston rod as in the SG 550/551 models, which address several reliability issues encountered in the SG 552 and also allows the usage of the standard SG 550/551 charging handle. The SG 553 series rifles have a 339 mm (13.3 in) long sight radius. A long barrel version of the SG 553 known as the SG 553 LB incorporates a 347 mm (13.7 in) barrel with provision to fire rifle grenades and support a bayonet. Further factory options for the SG 553 rifle series are an integrated receiver Picatinny rail and an adjustable butt stock.[7] The SG 553 R is a variant chambered for the 7.62×39mm cartridge fed from AK family box magazines.[8] There is also a .300 AAC Blackout variant of the SG 553 known as the SG 553 BK which was first shown at IWA OutdoorClassics in 2016.[9][10]

SG 552-A1

The SG 552-A1 is a SG 552 rifle that has been modified to function like the SG 553. The modifications are available as a conversion kit that includes a new bolt carrier, charging handle, recoil spring and gas tube.[citation needed]

SG 550-1 Sniper

Another member of the SG 550 family is the SG 550-1 Sniper variant designed at the request of the Swiss Police.[11] Introduced in 1988, This accurized rifle has a refined two-stage trigger (the pull force was reduced from 35 N (7.9 lbf) to 15 N (3.4 lbf), a heavy, hammer-forged 650 mm (25.6 in) long barrel with a 254 mm (1:10 in) rifling twist rate (it has no flash hider) and is used exclusively with telescopic sights. The new folding stock has an adjustable cheek piece and a spacer system on the butt, the ergonomic pistol grip's angle of inclination can be regulated, the forend was shortened, and the bipod features a height and cant adjustment mechanism. This model is no longer in production.

Civilian variants

The SG 550/551/552/553 are also available in semi-automatic only configurations, intended for the civilian shooting market. Among these variants are the SG 550/551/552 SP, PE 90 and SIG Sport rifles. The SG 550 series is available with either 178 mm or 254 mm (1:7 and 1:10 in) twist rate barrels. Rifles designated SG 55x-1 have a 254 mm (1:10 in) twist rate, while models marked SG 55x-2 have a 178 mm (1:7 in) twist rate. The ordinance GP 90 ammunition is optimized for use with the original Swiss 254 mm (1:10 in) rifling twist rate.

 
A SIG556 Classic equipped with an EOTech 512 holographic weapon sight and STANAG magazine.

Due to import restrictions, the American civilian market required a partially American-made version assembled by SIG SAUER, Inc. in Exeter, New Hampshire. The SIG556 is designed to meet these requirements. The 556 lacks full-auto capability and the overall length is 940 mm (37.0 in). One difference is a new aluminum lower receiver that accepts M16 STANAG magazines and an M4 telescoping buttstock. The barrel's twist rate is 178 mm (1:7 in).[12]

There are many variants of this rifle offered for sale. The first variant was sold with an aluminum Picatinny rail on the upper receiver and a series of plastic rails on the handguard. The market pushed SIG to produce the rifle with the slimmer profile 551-type handguards and a hooded front sight; this version is marketed as the SIG556 Classic.[13] Several folding stock models have been released as well as variants with railed forend combinations. Another variant is the SIG 556 DMR featuring a 18 in (457.2 mm) barrel.[14] SIG P556 pistol variants with 10-inch barrels are also available. In 2012 the SIG 556 R or SIG 556 Russian chambered for the 7.62×39mm cartridge and using AK-pattern box magazines was introduced.[15] The first generation of SIG556R rifles had a number of performance issues that were later resolved in later production runs of the SIG556R.

In January 2014, SIG introduced the 556xi series rifles as an improvement to the 556 and 556R series rifles.

As of May 2017, SIG has discontinued the SIG556, SIG556R, and 556xi series of rifles and no longer displays those models on the products section of their website.[16]

The SIG 522LR is a .22-caliber sporting rifle styled after the SG 551. It uses a simple blowback semi-automatic operating system and its barrel has a 406 mm (1:16 in) twist rate. Due to its operating principle, the rifle has no mechanical commonality with other SG 550 variants. The SIG522 accepts commonly available AR-style .22-caliber conversion magazines.

In the U.S, a variety of semi-automatic SwissArms firearms are available for sale. Due to U.S. import regulations, they are imported as a pistol.[17]

Regulation in Canada

On 27 February 2014, the Canadian semi-automatic "Classic Green" sporting rifle, also known as the Swiss Arms PE 90, was re-classified as a "prohibited weapon".[18] The rifle had been popular with hunters and gun enthusiasts, who until February 2014, only required a possession and acquisition licence to obtain the rifle. However, late in 2013, a gun dealer had imported some PE 90 rifles from Switzerland and brought them to Canada for sale. After some were sold, it was alleged that the rifles in question were of a variant not allowed in Canada (PE90). Upon investigation and examination by the RCMP, this was proven inconclusive, however, the RCMP went further and decided the versions in Canada were too close to the PE90 and reclassified the rifles and declared the entire model line prohibited, with possible confiscation for destruction. This caused outrage amongst owners and lobbyists, who felt that the RCMP exceeded their authority, and that such policy changes should be enacted by legislation.[citation needed] The National Firearms Association of Canada considered pursuit of the matter through the legal system.[19] On 31 July 2015, the Canadian government overturned the reclassification and returned the Swiss rifles to the original classifications.[20] On 1 May 2020, in the wake of the Nova Scotia attacks, the rifles were again reclassified as Prohibited Firearms via Order in Council.[21]

Accuracy potential

The following tables list accuracy statistics for typical in service Stgw 90 rifles firing Swiss 5,6 mm Gw Pat 90 service ammunition obtained by firing from the bipod. The statistics were computed under the 1990s Swiss method for determining accuracy, which is more complex than Western methods which usually involve firing a group of shots and then measuring the overall diameter of the group. The Swiss method differs in that after a group of shots is fired into the target from a machine rest hits on the outer part of the target are disregarded, while only half of the hits on the inner part of the circles are counted (50% or R50), which significantly reduces the overall diameter of the groups. The vertical and horizontal measurements of the reduced groups are then used to measure accuracy. This circular error probable method used by the Swiss and other European militaries cannot be converted and is not comparable to US military methods for determining rifle accuracy. When the R50 results are doubled the hit probability increases to 93.7%.

 
Circular error probable 20 hits distribution example
Single shot dispersion with Swiss 5,6 mm Gw Pat 90 service ammunition[22]
Range Horizontal accuracy of fire (R50) Vertical accuracy of fire (R50)
0 m (0 yd) 0 cm (0.0 in) 0 cm (0.0 in)
100 m (109 yd) 4 cm (1.6 in) 4 cm (1.6 in)
200 m (219 yd) 9 cm (3.5 in) 9 cm (3.5 in)
300 m (328 yd) 14 cm (5.5 in) 14 cm (5.5 in)
400 m (437 yd) 20 cm (7.9 in) 22 cm (8.7 in)
  • R50 means the closest 50 percent of the shot group will all be within a circle of the mentioned diameter.
  • R93.7 means the closest 93.7 percent of the shot group will all be within a circle of the mentioned diameter.
  • For rapid single shot series (5 rounds quickly fired within 2.5 to 5 seconds) the dispersion doubles compared to single shot fire.
  • In 3-round burst mode and fully automatic firing mode the dispersion quadruples compared to single shot fire.

For reference a 1 minute of arc (MOA) circle at 300 m (328 yd) has a diameter of 8.72 cm (3.4 in). The radius of a circle is half its diameter.

Acceptance accuracy requirements

The 300 m (328 yd) R50 dispersion of 14 cm (5.5 in) × 14 cm (5.5 in) from the above table was also the accuracy standard any Stgw 90 had to pass, firing a 24-round group of a machine rest. During production the Swiss military additionally demanded for acceptance at random selected new Stgw 90 weapons out of a production batch, firing a 24-round group with Swiss 5,6 mm Gw Pat 90 service ammunition of a machine rest at a range of 300 m (328 yd), the R50 horizontal and vertical dispersion had to average 7 cm (2.8 in) × 7 cm (2.8 in). Any result from an individual as such tested weapon, was not allowed to exceed a maximal R50 dispersion of 11 cm (4.3 in) × 11 cm (4.3 in).[3]

Gallery

  •  

    With bipod extended.

  •  

    With bayonet.

  •  

    Stock folded.

  •  

    Flash suppressor and gas regulator.

  •  

    The gas block integrates an adjustable gas regulator, the front sight with a flip-up night sight post, and the bayonet lug on the flash suppressor.

  •  

    The SG 552 Commando version with integral Picatinny rail and accessories.

Users

Country/Territory Organization name Model Quantity Date Reference
  Argentina GEOF, Federal Police

Grupo de Especial de Seguridad, Policia de Mendoza

SG 553 SOW SG 556 _ _ [23]

[24]

  Brazil Brazilian Federal Police, Brazilian Air Force PARA-SAR SG 550
SG 551 		_ _ [25]
  Canada Lethbridge Police Service SIG 553 _ _ [citation needed]
CN Police _ _
  Egypt Sa'ka Forces and Unit 777 SG 552 _ _ _[citation needed]
  Finland Helsinki Police Department, Karhu Team SG 552 _ _ [26]
  France Special Operations Command of the French Army SG 551
SG 551 LB 		_ _ [27]
National Gendarmerie Intervention Group (GIGN) of the National Gendarmerie SG 553 SOW _ _ [23]
  Germany GSG 9 of the German Federal Police SIG 553 SOW _ _ [23][28]
Spezialeinsatzkommando (Special Task Force) groups of some Landespolizei (State Police) _ _
  India National Security Guard SG 551 675 ~2010 [29][30]
  Indonesia Komando Pasukan Khusus (Kopassus) special forces group of the Indonesian Army SG 550
SG 552 		_ _ [31]
Komando Pasukan Katak (Kopaska) tactical diver group of the Indonesian Navy _ _
  Malaysia Grup Gerak Khas (GGK) Counter-Terrorism Forces of the Malaysian Army SG 553 LB
SG 553 SB
JMF Elite Forces Counter-Terrorism Forces of the Royal Johor Military Force
Pasukan Khas Udara (PASKAU) Counter-Terrorism Forces of the Royal Malaysian Air Force _ _ [32][33]
Special Task and Rescue (STAR) Maritime Counter-Terrorism Forces of the Malaysian Maritime Enforcement Agency _ _ [34]
  Malta Armed Forces of Malta SG 550 _ _ [1]
  Pakistan Special Service Group Counter-Terrorism Forces of the Pakistan Army _ _ _ [35]
  Poland GROM special forces of the Polish Armed Forces _ _ _ [23][36][37]
  Romania Detasamentul Cautare Salvare in Lupta (DCSL; Combat Search and Rescue) special forces of the Romanian Air Force SG 553 _ _ [38]
Romanian Naval Forces 307th Marine Infantry Regiment - reconnaissance units
  Saudi Arabia Royal Saudi Navy Special Forces Units SG 556 SWAT
SG 552
SG 556 SBR 		_ _ [39][40][41]
  Serbia Specijalna Antiteroristicka Jedinica (Special Anti-terrorist Unit) of the Serbian Police SIG SG 552 _ _ [42]
  Slovakia Útvar Osobitného Určenia (Special Assignments Unit) of the Slovak Police SG 551 SWAT _ _ [43]
  South Korea Special Sea Attack Team (SSAT) of the Korea Coast Guard SG 556 _ _ [44]
  Spain Grupo Especial de Operaciones of the Spanish National Police SG 551 SWAT
SG 552 		_ _ [45][46]
  Switzerland Swiss Armed Forces SG 550
SG 552
SG 553 		450,000[47] _ [48]
  Taiwan Wei-An Police Special Services Commando SG 551-1P _ 1994 [49]
  Turkey Karşı Atak Timi (Counter Attack Team), police special forces of the General Directorate of Security SG 553 _ _ [50]
  Tunisia Groupe d'Intervention Présidentielle (GIP) special forces of the Presidential Guard SG 552 [51]
  United Kingdom West Mercia Police SG 551 SWAT [52]
Derbyshire Police SG 552 [53]
West Yorkshire Police SG 552 [54][55]
Staffordshire Police
  United States Drug Enforcement Administration SG 551
SG 553 SOW 		_ _ [23][56]
Federal Bureau of Investigation SG 551 _ _ [56]
Special Weapons And Tactics (SWAT) counter-terrorism forces of the United States Capitol Police SG 550 _ _ [57]
   Vatican City Pontifical Swiss Guard SG 550
SG 552 		_ _ [58]
  Venezuela Venezuelan Marine Corps SG 550
SG 552 		_ _ [59]

See also

References

  1. ^ a b c "SIG SG 550 (Sturmgewehr Model 550) / Stgw 90 Assault Rifle / Carbine (1990)". Military Factory. 22 June 2014. from the original on 6 July 2017. Retrieved 24 December 2014.[better source needed]
  2. ^ . Ilag-ag.com. Archived from the original on 16 May 2009. Retrieved 9 July 2009.
  3. ^ a b "SIG 550 / 551 Technical Data and Test Documentation". from the original on 31 December 2014. Retrieved 25 December 2014.
  4. ^ "[www.snipercountry.de] - Scharfschützen Community". from the original on 14 July 2014. Retrieved 25 December 2014.
  5. ^ biggerhammer.net 22 August 2007 at the Wayback Machine Kern 4x24 telescopic sight of the Swiss Army.
  6. ^ David Crane (28 November 2001). "SIG 552 Commando Mini-Assault Rifle for Special Operations". DefenseReview.com (DR): An online tactical technology and military defense technology magazine with particular focus on the latest and greatest tactical firearms news (tactical gun news), tactical gear news and tactical shooting news. from the original on 21 October 2014. Retrieved 25 December 2014.
  7. ^ Preisliste_2009[permanent dead link]
  8. ^ Jürgen Kapella. "Swiss Arms: SG 553 R". from the original on 24 October 2014. Retrieved 25 December 2014.
  9. ^ B, Eric (20 May 2016). "Exclusive: SIG Sauer – Swiss Arms. 300 BLK, 7,62×39 and more…". The Firearm Blog. www.thefirearmblog.com. Retrieved 19 May 2022.
  10. ^ "Assault Rifle SG 553 BK". www.sigsauer.swiss. Sig Sauer. Retrieved 19 May 2022.
  11. ^ McCollum, Ian (31 December 2019). "SIG 550-1 Sniper: Answering a Question Nobody Asked". forgottenweapons.com. Forgotten Weapons. Retrieved 19 May 2022.
  12. ^ . www.sigsauer.com. Archived from the original on 11 July 2007.
  13. ^ . Archived from the original on 18 January 2016. Retrieved 25 December 2014.
  14. ^ "SIG Sauer 556 DMR Semi Automatic Rifle". cheaperthandirt.com. Retrieved 19 May 2022.
  15. ^ "SIG556R". from the original on 25 December 2014. Retrieved 25 December 2014.
  16. ^ "All Rifles | Sig Sauer". Sig Sauer. from the original on 31 January 2017. Retrieved 8 May 2017.
  17. ^ "Jdi Firearms, inc - Swiss Arms, Swat Training, Texas Concealed Carry".
  18. ^ "Gun debate reignites with rumored ban of Classic Green rifle". 28 February 2014. from the original on 8 January 2015. Retrieved 25 December 2014.
  19. ^ "Mounties trample Canadian gun owners". Vancouver 24 hrs. from the original on 25 December 2014. Retrieved 25 December 2014.
  20. ^ "Harper Government amends firearms classifications regulations". news.gc.ca. from the original on 7 August 2015. Retrieved 1 August 2015.
  21. ^ "Regulations Amending the Regulations Prescribing Certain Firearms and Other Weapons, Components and Parts of Weapons, Accessories, Cartridge Magazines, Ammunition and Projectiles as Prohibited, Restricted or Non-Restricted". May 2020. Retrieved 22 October 2020.
  22. ^ Reglement 53.096 d 5,6mm Sturmgewehr 1990(5,6mm Stgw 90), page 98
  23. ^ a b c d e "Swiss Arms (Sig) SG 553 SOW Commando". GunSite South Africa. 13 December 2007. from the original on 24 April 2012. Retrieved 25 March 2012.
  24. ^ . Archived from the original on 24 September 2015.
  25. ^ Jones, Richard D. Jane's Infantry Weapons 2009/2010. Jane's Information Group; 35 edition (27 January 2009). ISBN 978-0-7106-2869-5.
  26. ^ Suomen sotilas 3/2006
  27. ^ (in French). Defense.gouv.fr. 5 June 2013. Archived from the original on 20 September 2016.
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Bibliography

  • Règlement 53.96 Fusil d'assaut 5,6 mm 1990

External links

 
Wikimedia Commons has media related to:
SIG SG 550 (category)
  • Modern Firearms
  • Biggerhammer.net—portal for articles, information and manuals, etc. on the SIG Stgw 57/SG 510/AMT and SG 550 rifle series
  • SG 550/551 technical data and test documentation
  • The SIG SG 550 series—information, manuals and links
  • Swiss Armed Forces Stgw 90 manual (in German)
  • The Guns of Venezuela

January 13, 2023
this, article, includes, list, general, references, lacks, sufficient, corresponding, inline, citations, please, help, improve, this, article, introducing, more, precise, citations, 2016, learn, when, remove, this, template, message, assault, rifle, manufactur. This article includes a list of general references but it lacks sufficient corresponding inline citations Please help to improve this article by introducing more precise citations May 2016 Learn how and when to remove this template message The SG 550 is an assault rifle manufactured by Swiss Arms AG formerly a division of Schweizerische Industrie Gesellschaft now known as SIG Holding AG in Switzerland SG is an abbreviation for Sturmgewehr assault rifle The rifle is based on the earlier 5 56 45mm NATO SIG SG 540 SG 550The SIG SG 550 designated Stgw 90 German or Fass 90 French in the Swiss ArmyTypeAssault riflePlace of originSwitzerlandService historyIn service1990 presentUsed bySee UsersProduction historyDesignerSchweizerische Industrie GesellschaftDesigned1970s 1980sManufacturerSwiss Arms AG formerly Schweizerische Industrie Gesellschaft Produced1986 presentNo built600 000 VariantsSee VariantsSpecificationsMass4 1 kg 9 04 lb Length1 000 mm 39 4 in stock extended 772 mm 30 4 in stock folded Barrel length528 mm 20 8 in Cartridge5 56 45mm NATO known as 5 6mm Gw Pat 90 in Switzerland 7 62 39mm used in SG 553 R variant 300 AAC Blackout used in SG 553 BK variant ActionGas operated rotating boltRate of fire 700 rounds minMuzzle velocity911 m s 2 989 ft s Effective firing range100 400 m sight adjustmentsFeed system5 20 or 30 round detachable box magazine STANAG magazines SIG 556 series AK 47 magazines SG 553 R SIG 556 R SightsRear rotating diopter drum with tritium night inserts front hooded post with folding night post540 mm 21 3 in sight radius SG 550 Contents 1 History 1 1 Development 1 2 Production 2 Design details 2 1 Operating mechanism 2 2 Features 2 3 Sights 2 4 Accessories 3 Variants 3 1 SG 551 3 2 SG 552 Commando 3 3 SG 553 3 4 SG 552 A1 3 5 SG 550 1 Sniper 3 6 Civilian variants 3 7 Regulation in Canada 4 Accuracy potential 4 1 Acceptance accuracy requirements 5 Gallery 6 Users 7 See also 8 References 9 Bibliography 10 External linksHistory EditDevelopment Edit In 1978 the Swiss armed forces formulated requirements for a successor to the Stgw 57 battle rifle known commercially as the SG 510 using the 7 5 55mm GP 11 cartridge Emphasis was placed on modularity the weapon family was to include several variants of the base design including a compact carbine that would be issued to rear echelon and support troops command staff vehicle crews special forces personnel and paratroopers Another aim was to reduce the overall weight of the rifle while retaining comparable or improved accuracy out to 300 m The solicitation was narrowed down to two designs the W F C42 developed by the state owned Waffenfabrik Bern using both 6 45 48mm and 5 56 45mm cartridges and the SG 541 developed by SIG In 1981 the experimental 6 45mm GP 80 cartridge was rejected in favor of the more conventional 5 6 45mm Gw Pat 90 round with a 4 1 g tombac jacketed lead core projectile that is the Swiss equivalent to NATO s standard 5 56 45mm cartridge Forerunners of the Sig 550 The C42 by Waffenfabrik Bern here the 6 45mm Rifle version The C42 by Waffenfabrik Bern here the 6 45mm Carbine version Detail of the distinctive integral handguard of the C42 Detail of the top mounted arming lever of the C42 The SG 541 here the 6 45mm Carbine version Production Edit In February 1983 the decision to adopt the SG 541 was publicly announced the designation of the rifle was changed in October of the following year to SG 550 while the carbine version became known as the SG 551 Production began in 1986 and four years later the rifle was officially accepted into service in 1990 hence the military designation Stgw 90 Over 600 000 rifles have been delivered since then and production for the military has now ceased 1 Design details EditOperating mechanism Edit SG 550 disassembled into its main constituent groups The SG 550 is a selective fire 5 56 45mm NATO assault rifle firing from a closed bolt It has a gas actuated piston driven long stroke operating system derived from the SIG SG 540 series of rifles which uses burnt powder gases vented through a port in the barrel to power the weapon s moving parts Once inside the gas cylinder propellant gases pass through an L shaped channel machined in the piston head and are directed forward towards the gas valve The pressure build up in front of the piston head pushes the piston and bolt carrier rearward As the piston is driven back the gas port and the L shaped channel move out of alignment cutting off the supply of gas to the cylinder Surplus gas and powder residues are evacuated through an exhaust port in the gas cylinder The manually adjustable gas valve has two settings one for normal operation and the second setting for use in the presence of heavy fouling or icing The rotary bolt locking mechanism consists of two steel locking lugs that engage locking recesses in the breech and is identical to that used in the SG 540 A spring loaded extractor is incorporated into the bolt while a fixed protrusion on one of the receiver s internal guide rails ejects the spent cartridge casings Features Edit The rifle controls including fire selector safety The rifle is hammer fired and has a trigger mechanism with an ambidextrous safety and fire selector switch that has 4 settings S safe 1 single fire 3 3 round burst and 20 fully automatic fire The 3 round burst mode 3 and the fully automatic 20 position can be disabled by a rotating safety guard to avert accidentally activating the continuous fire mode The trigger is enclosed in a pivoting trigger guard which can be folded down to the left or right side allowing for unhindered operation with winter gloves The trigger pull is approximately 35 N 7 9 lbf The firearm is fed by lightweight 20 round box magazines 30 10 and 5 round magazines are also available The magazines are molded from a translucent polymer and can be locked together using studs in order to facilitate quicker reloading Jungle style The empty weight of a 20 round magazine is 95 g 3 4 oz and 110 g 3 9 oz for a 30 round magazine A bolt hold open device locks the bolt carrier assembly open after expending the last cartridge from the magazine and is released by lifting the bolt catch lever located on the left side of the receiver Alternatively a left handed shooter may release the bolt by pulling the rubber coated charging handle to rear a short distance The SG 550 has a side folding skeletonized buttstock folds to the right side of the receiver and a lightweight aluminium bipod that folds into grooves in the lower handguard The hinged stock is firmly locked in the folded position by a socket in the butt which clips into a plastic stud on the handguard a firm pull will release the stock which is then swung into the closed position and locked by a button catch A collapsible side folding stock is also available The stock pistol grip and handguards are made of a high strength polymer and are produced in either green or black colour options The steel receiver housing and several other components are manufactured using stamping and welding external steel surfaces are finished with a ceramic reinforced enamel coat known as Ilaflon 2 The heavy cold hammer forged barrel is screwed into the receiver and is equipped with a slotted bird cage type flash suppressor that is also used to launch rifle grenades using standard live ammunition or attach a knife bayonet the bayonet is supported by a lug located at the base of the gas block The rifled barrel has 6 right hand grooves and the Swiss Army specification 254 mm 1 10 in rifling twist rate is optimized for Swiss military GP 90 ammunition An export oriented barrel with a 178 mm 1 7 in twist rate is also available designed to stabilize 5 56 45mm NATO rounds with the heavier SS109 and tracer projectiles All rifles are test fired for accuracy and function prior to leaving the factory at the manufacturer s underground 300 m test range Random new rifles out of production were tested on a machine rest In a 24 single shot string starting with a cold weapon and using GP 90 ammunition the R50 or 50 windage and elevation dispersion of any individual weapon must have been within an 11 cm 4 3 in group at 300 m the 50 windage and elevation dispersion must have averaged 7 cm 2 8 in 3 The employed circular error probable method cannot be converted and is not comparable to US military methods for determining rifle accuracy When the R50 results are doubled the hit probability increases to 93 7 The gas system s components are made of stainless steel The barrel bolt bolt carrier and firing pin are all made with steel that has been gas nitrided hardened and tempered The bolt and carrier along with most other components internal to the receiver undergo a phosphating process Sights Edit Rotating diopter drum rear sight Tritium illuminated night sights The SG 550 series rifles have a 540 mm 21 3 in long sight radius and are equipped with iron sights adjustable for both windage and elevation The sights are similar to those on some Heckler amp Koch weapons such as the HK G3 or HK MP5 The sights consist of a rear rotating diopter drum soldered to the receiver and a hooded front post installed in the gas block The rear sight has an open notch setting marked 1 designed for immediate firing up to 100 m but also contains apertures with settings 2 3 and 4 corresponding to 200 300 and 400 m firing ranges The 400 m setting has a removable iris for sportive shooting The sights are adjustable via micrometer screws with windage and elevation increments of 0 15 mil 0 52 moa or 15 mm 0 6 in at 100 m For night use the dedicated 1 notch setting in the rear sight drum is provided with two self luminous tritium powered inserts fitted laterally on each side of the notch and additionally in a flip up post attached to the foresight When firing rifle grenades the front sight hood is aligned with the uppermost edge of the grenade s warhead this provides an estimated point of impact up to 75 m The rifle grenades intended for this purpose were FN Luchaire Type 58 N bullet though anti tank grenades An SG 550 equipped with the Kern 4 24 telescopic sight For designated marksman use the SG 550 is equipped with a Kern 4 24 telescopic sight on a quick detachable mount citation needed The sight weighs 730 g 26 oz and includes a variety of features such as STANAG 2324 MIL STD 1913 compliant mounting components a Bullet Drop Compensation BDC elevation adjustment knob for ranges from 100 to 600 m a tritium illuminated reticle that enables target acquisition in low light conditions and a diopter eyesight correction adjustment Included with the sight is a lens hood for mounting on the ocular that reduces image quality impairing stray light and a gray filter for glare reduction 4 The basic model of this optical sight was already used on the Stgw 57 5 The upper receiver can accept quick detachable rails and adapters used to mount optics STANAG 2324 compliant The scope mounting system consists of a centering hole located on the front face of the rear sight assembly and a dovetail like mounting point at the front end of the receiver Swiss Arms respectively Brugger amp Thomet offer several types of quick release scope mounts and Picatinny rails A version of the rifle with an integral receiver mounted Picatinny rail is also offered in this configuration the weapon is fitted with flip up emergency battle sights a rear aperture sight which folds down into a recess in the rail and a folding front blade Accessories Edit Swiss soldier with a SG 550 and a GL 5040 5140 grenade launcher Stgw 90 bayonet made by Wenger Both the rifle and carbine come standard with a spare magazine sling cleaning kit and a loading aid for rapid magazine filling The full sized SG 550 551 will accept SIG s 40 mm GL 5040 5140 grenade launcher Swiss military designation 40 mm Gewehraufsatz 97 which is mounted under the barrel via an eccentric latch and replaces the lower handguard The grenade launcher is a single shot breech loaded weapon that is supplied with a leaf sight that attaches to the rifle s rear sight base and enables accurate firing out to 200 m The lightweight aluminium launcher weighs 1 7 kg 3 7 lb unloaded and is operated independently of the rifle It can use a wide array of 40 46mm grenades including extended range high pressure types and non lethal baton or anti riot projectiles The compact SG 552 553 can be fitted with smaller GL 5340 underbarrel grenade launcher An Stgw 90 bayonet can also be mounted to the rifle The bayonet has an overall length of 310 mm and a muzzle ring diameter of 22 mm The 177 mm long blade is single edged and it has no fuller The bayonets are manufactured exclusively for the Swiss Army by Victorinox and in the past by Wenger until Victorinox acquired Wenger in 2005 With a proper lug adaptor the rifle will also accept a NATO pattern KCB 77 made originally by Carl Eickhorn of Solingen West Germany or the American M9 Variants EditSG 551 Edit SG 551 carbine The SG 551 carbine has a short pattern 363 mm 14 3 in barrel gas tube and piston compared to the SG 550 The SG 551 series rifles have a 466 mm 18 3 in long sight radius The handguards were also changed and the bipod removed The SG 551 cannot be used with a bayonet or fire rifle grenades The SG 551 comes in several specialized variants designed for use with security and special forces Among those variants are SG 551 1P police carbine designed to engage point targets out to 300 m equipped with a Hensoldt 6x42 BL telescopic sight and detachable cheek riser SG 551 SWAT carbine coated with a corrosion resistant finish and equipped with an optical sight mount used with a wide array of sights and can also accept mission critical accessories such as a bipod laser pointer or tactical light SG 551 LB carbine with an extended 454 mm 17 9 in barrel that enables the use of rifle grenades and a bayonet 1 SG 552 Commando Edit The compact SG 552 Commando carbine with 30 round magazine The compact SG 552 Commando full designation as the 552 2P 6 carbine was released in July 1998 It has a shorter 226 mm 8 9 in barrel with an open 3 prong flash suppressor and gas tube ventilated handguards and a redesigned bolt carrier group that was integrated with the piston rod to form a single moving assembly The SG 552 series rifles have a 360 mm 14 2 in long sight radius The return mechanism has been moved to the rear of the receiver housing and its recoil spring is guided in a way analogous to that of the AK 47 on a steel guide rod later models feature a polymer guide rod resting against the lower receiver s rear surface under tension of the compressed recoil spring Like the SG 550 551 this model can accept rails and accessories enabling the use of optics A long barrel version of the SG 552 known as the SG 552 LB incorporates a 346 mm 13 6 in barrel with provision to fire rifle grenades and support a bayonet The SG 552 models were discontinued in 2008 and replaced by the SG 553 Upgrade part kits are available to convert a SG 552 in to a SG 553 SG 553 Edit SG 553 in the hands of Malaysian Air Force PASKAU commando during LIMA 2009 The SG 553 is an improved version of the SG 552 and was released in 2008 Even though it mostly resembles the SG 552 the SG 553 has one key advantage the recoil spring is now wrapped around the piston rod as in the SG 550 551 models which address several reliability issues encountered in the SG 552 and also allows the usage of the standard SG 550 551 charging handle The SG 553 series rifles have a 339 mm 13 3 in long sight radius A long barrel version of the SG 553 known as the SG 553 LB incorporates a 347 mm 13 7 in barrel with provision to fire rifle grenades and support a bayonet Further factory options for the SG 553 rifle series are an integrated receiver Picatinny rail and an adjustable butt stock 7 The SG 553 R is a variant chambered for the 7 62 39mm cartridge fed from AK family box magazines 8 There is also a 300 AAC Blackout variant of the SG 553 known as the SG 553 BK which was first shown at IWA OutdoorClassics in 2016 9 10 SG 552 A1 Edit The SG 552 A1 is a SG 552 rifle that has been modified to function like the SG 553 The modifications are available as a conversion kit that includes a new bolt carrier charging handle recoil spring and gas tube citation needed SG 550 1 Sniper Edit Another member of the SG 550 family is the SG 550 1 Sniper variant designed at the request of the Swiss Police 11 Introduced in 1988 This accurized rifle has a refined two stage trigger the pull force was reduced from 35 N 7 9 lbf to 15 N 3 4 lbf a heavy hammer forged 650 mm 25 6 in long barrel with a 254 mm 1 10 in rifling twist rate it has no flash hider and is used exclusively with telescopic sights The new folding stock has an adjustable cheek piece and a spacer system on the butt the ergonomic pistol grip s angle of inclination can be regulated the forend was shortened and the bipod features a height and cant adjustment mechanism This model is no longer in production Civilian variants Edit The SG 550 551 552 553 are also available in semi automatic only configurations intended for the civilian shooting market Among these variants are the SG 550 551 552 SP PE 90 and SIG Sport rifles The SG 550 series is available with either 178 mm or 254 mm 1 7 and 1 10 in twist rate barrels Rifles designated SG 55x 1 have a 254 mm 1 10 in twist rate while models marked SG 55x 2 have a 178 mm 1 7 in twist rate The ordinance GP 90 ammunition is optimized for use with the original Swiss 254 mm 1 10 in rifling twist rate A SIG556 Classic equipped with an EOTech 512 holographic weapon sight and STANAG magazine Due to import restrictions the American civilian market required a partially American made version assembled by SIG SAUER Inc in Exeter New Hampshire The SIG556 is designed to meet these requirements The 556 lacks full auto capability and the overall length is 940 mm 37 0 in One difference is a new aluminum lower receiver that accepts M16 STANAG magazines and an M4 telescoping buttstock The barrel s twist rate is 178 mm 1 7 in 12 There are many variants of this rifle offered for sale The first variant was sold with an aluminum Picatinny rail on the upper receiver and a series of plastic rails on the handguard The market pushed SIG to produce the rifle with the slimmer profile 551 type handguards and a hooded front sight this version is marketed as the SIG556 Classic 13 Several folding stock models have been released as well as variants with railed forend combinations Another variant is the SIG 556 DMR featuring a 18 in 457 2 mm barrel 14 SIG P556 pistol variants with 10 inch barrels are also available In 2012 the SIG 556 R or SIG 556 Russian chambered for the 7 62 39mm cartridge and using AK pattern box magazines was introduced 15 The first generation of SIG556R rifles had a number of performance issues that were later resolved in later production runs of the SIG556R In January 2014 SIG introduced the 556xi series rifles as an improvement to the 556 and 556R series rifles As of May 2017 SIG has discontinued the SIG556 SIG556R and 556xi series of rifles and no longer displays those models on the products section of their website 16 The SIG 522LR is a 22 caliber sporting rifle styled after the SG 551 It uses a simple blowback semi automatic operating system and its barrel has a 406 mm 1 16 in twist rate Due to its operating principle the rifle has no mechanical commonality with other SG 550 variants The SIG522 accepts commonly available AR style 22 caliber conversion magazines In the U S a variety of semi automatic SwissArms firearms are available for sale Due to U S import regulations they are imported as a pistol 17 Regulation in Canada Edit On 27 February 2014 the Canadian semi automatic Classic Green sporting rifle also known as the Swiss Arms PE 90 was re classified as a prohibited weapon 18 The rifle had been popular with hunters and gun enthusiasts who until February 2014 only required a possession and acquisition licence to obtain the rifle However late in 2013 a gun dealer had imported some PE 90 rifles from Switzerland and brought them to Canada for sale After some were sold it was alleged that the rifles in question were of a variant not allowed in Canada PE90 Upon investigation and examination by the RCMP this was proven inconclusive however the RCMP went further and decided the versions in Canada were too close to the PE90 and reclassified the rifles and declared the entire model line prohibited with possible confiscation for destruction This caused outrage amongst owners and lobbyists who felt that the RCMP exceeded their authority and that such policy changes should be enacted by legislation citation needed The National Firearms Association of Canada considered pursuit of the matter through the legal system 19 On 31 July 2015 the Canadian government overturned the reclassification and returned the Swiss rifles to the original classifications 20 On 1 May 2020 in the wake of the Nova Scotia attacks the rifles were again reclassified as Prohibited Firearms via Order in Council 21 Accuracy potential EditThe following tables list accuracy statistics for typical in service Stgw 90 rifles firing Swiss 5 6 mm Gw Pat 90 service ammunition obtained by firing from the bipod The statistics were computed under the 1990s Swiss method for determining accuracy which is more complex than Western methods which usually involve firing a group of shots and then measuring the overall diameter of the group The Swiss method differs in that after a group of shots is fired into the target from a machine rest hits on the outer part of the target are disregarded while only half of the hits on the inner part of the circles are counted 50 or R50 which significantly reduces the overall diameter of the groups The vertical and horizontal measurements of the reduced groups are then used to measure accuracy This circular error probable method used by the Swiss and other European militaries cannot be converted and is not comparable to US military methods for determining rifle accuracy When the R50 results are doubled the hit probability increases to 93 7 Circular error probable 20 hits distribution example Single shot dispersion with Swiss 5 6 mm Gw Pat 90 service ammunition 22 Range Horizontal accuracy of fire R50 Vertical accuracy of fire R50 0 m 0 yd 0 cm 0 0 in 0 cm 0 0 in 100 m 109 yd 4 cm 1 6 in 4 cm 1 6 in 200 m 219 yd 9 cm 3 5 in 9 cm 3 5 in 300 m 328 yd 14 cm 5 5 in 14 cm 5 5 in 400 m 437 yd 20 cm 7 9 in 22 cm 8 7 in R50 means the closest 50 percent of the shot group will all be within a circle of the mentioned diameter R93 7 means the closest 93 7 percent of the shot group will all be within a circle of the mentioned diameter For rapid single shot series 5 rounds quickly fired within 2 5 to 5 seconds the dispersion doubles compared to single shot fire In 3 round burst mode and fully automatic firing mode the dispersion quadruples compared to single shot fire For reference a 1 minute of arc MOA circle at 300 m 328 yd has a diameter of 8 72 cm 3 4 in The radius of a circle is half its diameter Acceptance accuracy requirements Edit The 300 m 328 yd R50 dispersion of 14 cm 5 5 in 14 cm 5 5 in from the above table was also the accuracy standard any Stgw 90 had to pass firing a 24 round group of a machine rest During production the Swiss military additionally demanded for acceptance at random selected new Stgw 90 weapons out of a production batch firing a 24 round group with Swiss 5 6 mm Gw Pat 90 service ammunition of a machine rest at a range of 300 m 328 yd the R50 horizontal and vertical dispersion had to average 7 cm 2 8 in 7 cm 2 8 in Any result from an individual as such tested weapon was not allowed to exceed a maximal R50 dispersion of 11 cm 4 3 in 11 cm 4 3 in 3 Gallery Edit With bipod extended With bayonet Stock folded Flash suppressor and gas regulator The gas block integrates an adjustable gas regulator the front sight with a flip up night sight post and the bayonet lug on the flash suppressor The SG 552 Commando version with integral Picatinny rail and accessories Users EditCountry Territory Organization name Model Quantity Date Reference Argentina GEOF Federal Police Grupo de Especial de Seguridad Policia de Mendoza SG 553 SOW SG 556 23 24 Brazil Brazilian Federal Police Brazilian Air Force PARA SAR SG 550SG 551 25 Canada Lethbridge Police Service SIG 553 citation needed CN Police Egypt Sa ka Forces and Unit 777 SG 552 citation needed Finland Helsinki Police Department Karhu Team SG 552 26 France Special Operations Command of the French Army SG 551SG 551 LB 27 National Gendarmerie Intervention Group GIGN of the National Gendarmerie SG 553 SOW 23 Germany GSG 9 of the German Federal Police SIG 553 SOW 23 28 Spezialeinsatzkommando Special Task Force groups of some Landespolizei State Police India National Security Guard SG 551 675 2010 29 30 Indonesia Komando Pasukan Khusus Kopassus special forces group of the Indonesian Army SG 550SG 552 31 Komando Pasukan Katak Kopaska tactical diver group of the Indonesian Navy Malaysia Grup Gerak Khas GGK Counter Terrorism Forces of the Malaysian Army SG 553 LBSG 553 SBJMF Elite Forces Counter Terrorism Forces of the Royal Johor Military ForcePasukan Khas Udara PASKAU Counter Terrorism Forces of the Royal Malaysian Air Force 32 33 Special Task and Rescue STAR Maritime Counter Terrorism Forces of the Malaysian Maritime Enforcement Agency 34 Malta Armed Forces of Malta SG 550 1 Pakistan Special Service Group Counter Terrorism Forces of the Pakistan Army 35 Poland GROM special forces of the Polish Armed Forces 23 36 37 Romania Detasamentul Cautare Salvare in Lupta DCSL Combat Search and Rescue special forces of the Romanian Air Force SG 553 38 Romanian Naval Forces 307th Marine Infantry Regiment reconnaissance units Saudi Arabia Royal Saudi Navy Special Forces Units SG 556 SWATSG 552SG 556 SBR 39 40 41 Serbia Specijalna Antiteroristicka Jedinica Special Anti terrorist Unit of the Serbian Police SIG SG 552 42 Slovakia Utvar Osobitneho Urcenia Special Assignments Unit of the Slovak Police SG 551 SWAT 43 South Korea Special Sea Attack Team SSAT of the Korea Coast Guard SG 556 44 Spain Grupo Especial de Operaciones of the Spanish National Police SG 551 SWATSG 552 45 46 Switzerland Swiss Armed Forces SG 550 SG 552 SG 553 450 000 47 48 Taiwan Wei An Police Special Services Commando SG 551 1P 1994 49 Turkey Karsi Atak Timi Counter Attack Team police special forces of the General Directorate of Security SG 553 50 Tunisia Groupe d Intervention Presidentielle GIP special forces of the Presidential Guard SG 552 51 United Kingdom West Mercia Police SG 551 SWAT 52 Derbyshire Police SG 552 53 West Yorkshire Police SG 552 54 55 Staffordshire Police United States Drug Enforcement Administration SG 551SG 553 SOW 23 56 Federal Bureau of Investigation SG 551 56 Special Weapons And Tactics SWAT counter terrorism forces of the United States Capitol Police SG 550 57 Vatican City Pontifical Swiss Guard SG 550SG 552 58 Venezuela Venezuelan Marine Corps SG 550SG 552 59 See also EditSIG SG 530 SIG SG 540 SIG Sauer SIG516 Gun politics in Switzerland List of assault rifles List of carbines List of sniper riflesReferences Edit a b c SIG SG 550 Sturmgewehr Model 550 Stgw 90 Assault Rifle Carbine 1990 Military Factory 22 June 2014 Archived from the original on 6 July 2017 Retrieved 24 December 2014 better source needed ILAG Industrielack AG Swiss quality coatings Ilag ag com Archived from the original on 16 May 2009 Retrieved 9 July 2009 a b SIG 550 551 Technical Data and Test Documentation Archived from the original on 31 December 2014 Retrieved 25 December 2014 www snipercountry de Scharfschutzen Community Archived from the original on 14 July 2014 Retrieved 25 December 2014 biggerhammer net Archived 22 August 2007 at the Wayback Machine Kern 4x24 telescopic sight of the Swiss Army David Crane 28 November 2001 SIG 552 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Rifleman An Official Journal of the NRA Archived from the original on 18 January 2016 Retrieved 25 December 2014 SIG Sauer 556 DMR Semi Automatic Rifle cheaperthandirt com Retrieved 19 May 2022 SIG556R Archived from the original on 25 December 2014 Retrieved 25 December 2014 All Rifles Sig Sauer Sig Sauer Archived from the original on 31 January 2017 Retrieved 8 May 2017 Jdi Firearms inc Swiss Arms Swat Training Texas Concealed Carry Gun debate reignites with rumored ban of Classic Green rifle 28 February 2014 Archived from the original on 8 January 2015 Retrieved 25 December 2014 Mounties trample Canadian gun owners Vancouver 24 hrs Archived from the original on 25 December 2014 Retrieved 25 December 2014 Harper Government amends firearms classifications regulations news gc ca Archived from the original on 7 August 2015 Retrieved 1 August 2015 Regulations Amending the Regulations Prescribing Certain Firearms and Other Weapons Components and Parts of Weapons Accessories Cartridge Magazines Ammunition and Projectiles as Prohibited Restricted or Non Restricted May 2020 Retrieved 22 October 2020 Reglement 53 096 d 5 6mm Sturmgewehr 1990 5 6mm Stgw 90 page 98 a b c d e Swiss Arms Sig SG 553 SOW Commando GunSite South Africa 13 December 2007 Archived from the original on 24 April 2012 Retrieved 25 March 2012 fuerzasaeronavales Archived from the original on 24 September 2015 Jones Richard D Jane s Infantry Weapons 2009 2010 Jane s Information Group 35 edition 27 January 2009 ISBN 978 0 7106 2869 5 Suomen sotilas 3 2006 Terre SIG 551 in French Defense gouv fr 5 June 2013 Archived from the original on 20 September 2016 Archived copy PDF Archived from the original PDF on 16 July 2011 Retrieved 6 October 2012 a href Template Cite web html title Template Cite web cite web a CS1 maint archived copy as title link Post 26 11 NSG aims for corner shot weapons through the wall radars Archived from the original on 11 November 2009 Retrieved 25 December 2014 Karp Aaron Rajagopalan Rajesh January 2014 Small Arms of the Indian State A Century of Procurement and Production PDF Issue Brief Small Arms Survey 4 5 7 JSTOR resrep10661 Archived PDF from the original on 2 January 2019 Retrieved 2 January 2019 Kopassus amp Kopaska Specijalne Postrojbe Republike Indonezije in Croatian Hrvatski Vojnik Magazine Archived from the original on 22 August 2010 Retrieved 12 June 2010 Thompson Leroy December 2008 Malaysian Special Forces Special Weapons Archived from the original on 2 April 2012 Retrieved 28 November 2009 Zabry Mohamad Madzlan 10 December 2008 Sig SG 553 is a new rifle for PASKAU Utusan Malaysia Archived from the original on 3 June 2009 Retrieved 28 November 2009 MalaysiaDefender DSA2012 SIG SG 553 Pilihan Pasukan Elit in Malay Archived from the original on 1 August 2013 Retrieved 17 January 2012 Dan Alex Pakistan Special Service Group Archived from the original on 13 June 2016 Retrieved 8 June 2016 better source needed Wilk REMOV Remigiusz Nowe gromy GROM Archived from the original on 26 March 2010 GROM Utility and Equipment Archived from the original on 8 February 2012 Retrieved 2 August 2009 Arhangheli pe Borcea 8 October 2016 Archived from the original on 14 October 2016 Retrieved 16 October 2016 https i imgur com beTshQN jpg bare URL image file https i imgur com AGObXCc jpg bare URL image file https i imgur com 27xpuHL jpg bare URL image file SAJ Specialna Anti teroristicka Jedinica rtbot net Archived from the original on 24 September 2015 Specialne jednotky Slovenskej republiky Specialunits sk Archived from the original on 15 July 2009 Retrieved 9 July 2009 Adrenaline Burn Out Part1 INSITE TV 11 January 2013 Archived from the original on 27 May 2016 Retrieved 10 October 2013 Web Del Grupo Especial De Operaciones G E O Policia es Archived from the original on 6 June 2009 Retrieved 9 July 2009 Web Del Grupo Especial De Operaciones G E O Policia es Archived from the original on 13 December 2008 Retrieved 9 July 2009 Small Arms Survey 2015 Red Flags and Buicks Global Firearms Stockpiles Small Arms Survey 2002 Counting the Human Cost Oxford University Press p 78 Archived from the original PDF on 29 August 2018 Retrieved 29 August 2018 Sturmgewehr 90 Stgw 90 Lba admin ch 20 November 2008 Archived from the original on 3 February 2009 Retrieved 9 July 2009 http www wargamehk com SG551 htm Archived 29 September 2017 at the Wayback Machine 台灣的維安特勤隊是世界上少數使用 SG550 1P 的反恐怖特警隊 Traditional Chinese http www haberturk com gundem haber 662480 cat timine 100 yeni tabanca Archived 16 January 2012 at the Wayback Machine Turkish https fbcdn sphotos c a akamaihd net hphotos ak prn1 t1 1560770 658196010886458 2135580448 n jpg Archived 22 February 2014 at the Wayback Machine GIP Operator with SIG 552 Photograph JPG Oi55 tinypic com Archived from the original on 14 September 2014 Retrieved 30 April 2015 British Armed Response Unit Elite UK Forces Archived from the original on 9 February 2016 Retrieved 23 January 2016 Cadets Cause a Riot www yorkshirearmycadets co uk Archived from the original on 1 February 2014 Photograph Staffordshire pcc gov uk Archived from the original JPG on 24 September 2015 Retrieved 30 April 2015 a b Exeter s Sigarms gets 115 million federal rifle contract Premium1 fosters com 11 July 2003 Archived from the original on 11 July 2011 Retrieved 17 November 2009 SWAT Weapons Military Factory 30 December 2015 Archived from the original on 25 January 2016 Retrieved 1 February 2016 better source needed https www guns com news 2017 04 16 guns swiss guard Archived 29 July 2014 at the Wayback Machine Guns of the Swiss Guard O Grady Mary Anastasia 6 August 2017 The Guns of Venezuela The Wall Street Journal Archived from the original on 6 March 2018 Retrieved 31 March 2018 Bibliography EditReglement 53 96 Fusil d assaut 5 6 mm 1990External links Edit Wikimedia Commons has media related to SIG SG 550 category Swiss Arms PE 90 brochure Modern Firearms Biggerhammer net portal for articles information and manuals etc on the SIG Stgw 57 SG 510 AMT and SG 550 rifle series SG 550 551 technical data and test documentation The SIG SG 550 series information manuals and links SG 550 551 instruction manual SG 552 instruction manual Swiss Armed Forces Stgw 90 manual in German The Guns of Venezuela Retrieved from https en wikipedia org w index php title SIG SG 550 amp oldid 1116136833, wikipedia, wiki, book, books, library,

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