Features a Hensoldt optic and a detachable cheek riser. 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 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.  Manufactured by SIG Sauer Inc. in New Hampshire. With the right adapters, the SG 550 can be fitted with the Eickhorn KCB-77 or American M9 bayonet.
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.
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. 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. 550-1 The muzzle was designed as such that it could fire rifle grenades to further broaden the tactical reach of the standard infantryman. The trigger pull is approximately 35 N (7.9 lbf). In January 2014, SIG introduced the 556xi series rifles as an improvement to the 556 and 556R series rifles. The modifications are available as a conversion kit that includes a new bolt carrier, charging handle, recoil spring and gas tube. Take your favorite fandoms with you and never miss a beat. The handguards were also changed and the bipod removed.  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. The weapon utilized a gas-operated, rotating bolt action in which the gas cylinder was mounted over the barrel and both of the assemblies were shrouded over by the plastic handguard. SIG PE 57: (Privat Einzelfeuer) semi-automatic only civilian version available in 7.5×55mm GP 11 Swiss. Shortened version of the SG 550 featuring the same length handguard but a 14.3 in (36 cm) barrel and a shorter gas tube and gas piston. 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. The barrel's twist rate is 178 mm (1:7 in).. 1986 SG 552-A1: SG 552 converted to SG 553 standard. There are many variants of this rifle offered for sale. 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. For designated marksman use, the SG 550 is equipped with a Kern 4x24 telescopic sight on a quick-detachable mount. | Content ©www.MilitaryFactory.com. Swiss Arms (respectively Brügger & Thomet) offer several types of quick-release scope mounts and Picatinny rails. After SIG's firearms division was privatized in 2000, production of the SG 550 series of rifles was handed over to SAN Swiss Arms AG (now SIG Sauer AG). Introduced in 1988. The stock, pistol grip, and handguards are made of a high-strength polymer, and are produced in either green or black colour options.  Variants of the SG 553 exist: Semi-automatic version of the SG 550 series partially made in the United States due to import restrictions. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. Another major variant is a SIG556 DMR. 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. Cyclic rate In 1981, the experimental 6.45mm GP 80 cartridge was rejected in favor of the more conventional 5.6×45mm GP 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.
553 The SG 552-A1 is a SG 552 rifle that has been modified to function like the SG 553. 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. One difference is a new aluminum lower receiver that accepts M16 STANAG magazines and an M4 telescoping buttstock. 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. SG 551-1P: Police carbine version. Numerous variants of the SG 551 exist: Officially known as the SG 552-2P, introduced in July 1998. Battle rifle versions of the SG 550 family.. It has a black finish with a quad r … Right side view of the Swiss SIG SG 550 assault rifle; note collapsed bipod under the handguard, Authored By: Staff Writer | Last Edited: Like the SG 550/551, this model can accept rails and accessories enabling the use of optics.
The barrels are cold hammer forged steel which is gas nitrided, hardened and tempered; they are fitted with birdcage flash hiders. Variants exist: Sub-caliber sporting rifle version styled after the SG 551.
[Source] • [Talk] The rifle is based on the earlier 5.56×45mm NATO SIG SG 540. The bayonet has an overall length of 310 mm and a muzzle ring diameter of 22 mm.
The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws.  On 31 July 2015, the Canadian government overturned the reclassification and returned the Swiss rifles to the original classifications. Adopted in 1990 as the Stgw 90 (Sturmgewehr) in Switzerland and the F ass 90 (Fusil d'assault) in France. 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. Also known as the SG 550-1. The SG 551 comes in several specialized variants designed for use with security and special forces. The SG 551 comes in several specialized variants designed for use with security and special forces. Assault rifle The SIG SG 550 (Sturmgewehr Model 550) series was born in a Swiss Army initiative requiring an automatic weapon chambered for the 5.56x45mm NATO cartridge as a replacement for its 1950s-era SIG SG 510 Battle Rifle. 550: 9.04 pounds (4.10 kilograms)550 SR: 15.5 pounds (7.0 kilograms)551: 7.5 pounds (3.4 kilograms)552 Commando, 553: 7.1 pounds (3.2 kilograms) The sights are similar to those on some Heckler & Koch weapons, such as the HK G3 or HK MP5. SG 551 LB: Features extended 17.9 in (45 cm) barrel. 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. Sig Sauer Rifles-Pistols.
SG 553 SOW: Version intended for use by special operations units. Due to its operating principle, the rifle has no mechanical commonality with other SG 550 variants. The upper receiver has the capability to mount optics or other attachments.
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). Based on the previous SG 540, the SG 550 is the current service rifle of Switzerland. SwitzerlandDenmarkMalaysia The SG 551 cannot be used with a bayonet or fire rifle grenades.
Production began However, late in 2013, a gun dealer had imported some PE 90 rifles from Switzerland and brought them to Canada for sale. 600,000 rifles were delivered as of 2012.  No longer in production. 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. 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. Due to import restrictions, the American civilian market required a partially American-made version assembled by SIG SAUER, Inc. in Exeter, New Hampshire. 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. 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. Upgrade kits available to convert an SG 552 into an SG 553.
The SG 550 features a bolt hold-open device which locks the bolt open when the gun is empty; the shooter can simply lift the bolt catch lever on the left of the rifle or tug on the charging handle.. Designer(s) Switzerland Features a shorter barrel, shorter overall profile and redesigned action. 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.
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