The SG 551 carbine has a short pattern 363 mm (14.3 in) barrel, gas tube and piston compared to the SG 550.
Like the SG 550/551, this model can accept rails and accessories enabling the use of optics.
The 400 m setting has a removable iris for sportive shooting. The SG 541 was adopted as the next standard Swiss Army self-loading weapon system in 1983 (becoming the SG 550 in 1984) and known formally in the Swiss Army inventory as the "Sturmgewehr 90 (Stgw 90)".
SG 551 SWAT: Features corrosion-resistant finish and optical sight mount. After some were sold, it was alleged by another retailer that they had previously been fully automatic, converted to semi-automatic. The rifle is based on the earlier 5.56×45mm NATO SIG SG 540.
The 556 lacks full-auto capability and the overall length is 940 mm (37.0 in). 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 SG 550/551/552/553 are also available in semi-automatic only configurations, intended for the civilian shooting market. SG 551-1P: Police carbine version.
, The SG 550 feeds from lightweight box magazines made of a translucent polymer. This variant is not the same as privatised former Swiss Army service rifles.
 Discontinued as of March 2017.
After formal evaluations of two competing systems - the W+F C42 from Swiss Federal Arms Factory and the SIG SG 541 - the SIG submission was selected as the winner.
)", "Red Flags and Buicks: Global Firearms Stockpiles", https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-prn1/t1/1560770_658196010886458_2135580448_n.jpg, "Exeter's Sigarms gets $115 million federal rifle contract", http://www.guns.com/2014/04/13/guns-swiss-guard/, Biggerhammer.net—portal for articles, information and manuals, etc.
Features a Hensoldt optic and a detachable cheek riser. 90 (Swiss Army)F ass 90 (France)PE 90  On May 1, 2020, the rifles were again reclassified as Prohibited Firearms via Order in Council..
 No longer in production.
The SG 552-A1 is a SG 552 rifle that has been modified to function like the SG 553. The SG 552 Commando version with integral Picatinny rail and accessories.
The SG 550 series is available with either 178 mm or 254 mm (1:7 and 1:10 in) twist rate barrels.
The SIG SG 550 (SturmGewehr) is a Swiss assault rifle designed by Jürgen Baumann and Ennio Mattarelli around 1978 and produced by Schweizerische Industrie-Gesellschaft since 1986; production of the rifle is currently handled by SIG Sauer AG (formerly SAN Swiss Arms AG) with the privatization of SIG's firearms division in 2000. Can mount underbarrel. The magazine release lever was situated between the trigger guard and magazine well in the usual way and available mountings allowed use of a bayonet.
In the U.S, a variety of semi-automatic SwissArms firearms are available for sale.
The gas system's components are made of stainless steel.
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.
Another member of the SG 550 family is the SG 550 Sniper variant (also designated SG 550-1) designed specifically for Swiss security forces. A rotating safety guard is present on the weapon which can be flipped down to prevent the accidental activation of the fully-automatic fire mode when the user intends to fire in bursts only.
Features a lighter two-stage trigger, a heavier hammer-forged barrel, a new folding stock with adjustable cheek piece, a new adjustable pistol grip and a new adjustable bipod. SIG SG 550
The 6.5mm and the SG C42 were ultimately rejected in 1981 in favor of the 5.6×45mm cartridge.
"SG" is an abbreviation for Sturmgewehr (assault rifle).  Full-length rifles can be fitted with the SIG GL 5040 or 5140 underbarrel grenade launchers, while carbine-length rifles can be fitted with the compact GL 5340 grenade launcher.
SIG 556R: Version chambered for 7.62×39mm. This features a 21 in (533.4 mm) long barrel without flash suppressor, upgraded, a match type trigger, Magpul PRS stock and older style plastic handguards.
SG 552-A1: SG 552 converted to SG 553 standard.
An Stgw 90 bayonet can also be mounted to the rifle.
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. A collapsible side-folding stock is also available.
 Variants of the SG 553 exist: Semi-automatic version of the SG 550 series partially made in the United States due to import restrictions.
Discontinued as of May 2017. A decision was made to adopt the SG 541 in 1983, and the rifle entered service in 1986 with the Swiss Army. A Kern 4×24 optic is installed for designated marksman use; this type of sight was already used on the SG 510.
Right side view of the Swiss SIG SG 550 assault rifle; note collapsed bipod under the handguard, Authored By: Staff Writer | Last Edited: The modifications are available as a conversion kit that includes a new bolt carrier, charging handle, recoil spring and gas tube. Production began in 1986 and four years later the rifle was officially accepted into service in 1990, hence the military designation Stgw 90.
Swiss Arms (respectively Brügger & Thomet) offer several types of quick-release scope mounts and Picatinny rails.
600,000+ SG 552 LB: Features longer 13.6 in (35 cm) barrel. Only key components - those required to absorb the punishment of the firing action - were left metal while the shoulder stock, handguard and magazine were all of plastic.
Both designs were initially tested with the 6.45mm GP 80 cartridge and the 5.6x45mm GP 90 cartridge (the latter essentially the Swiss version of the 5.56x45mm NATO cartridge) with the 5.6x45 winning out. Another major variant is a SIG556 DMR.
Jürgen BaumannEnnio Mattarelli Based on the previous SG 540, the SG 550 is the current service rifle of Switzerland.
Standard tritium iron sights were fitted for low-level light work though optics could be affixed across the top of the receiver as required.
 All rifles are test-fired for accuracy and function before leaving the factory. The weapon features a side-folding skeletonized buttstock which locks into a stud on the handguard; some versions feature a folding bipod made of an aluminum alloy which folds into grooves in the lower handguard. Among those variants are: The compact SG 552 Commando (full designation as the 552-2P) carbine was released in July 1998.
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5.6mm Gw Pat 90 (5.56×45mm NATO)7.62×39mm (553 R, 556 R, 556xi) As the action moves rearwards, the supply of gas is cut off as the gas port and L-shaped channel move out of alignment; any unneeded gas is bled out through an exhaust port in the gas cylinder. 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). Number built 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. Due to civilian interest in the SG550-1, SIG recently decided to build a U.S.-made version named the 556 tailored for the American market. The barrels are cold hammer forged steel which is gas nitrided, hardened and tempered; they are fitted with birdcage flash hiders. 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 5.6×45mm cartridges) and the SG 541 (developed by SIG).
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.
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. Caliber 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.
The bolt and carrier, along with most other components internal to the receiver undergo a phosphating process. 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 trigger pull is approximately 35 N (7.9 lbf). 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.
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