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  • SIG SG 550 (Sturmgewehr Model 550) / Stgw 90 Assault Rifle / Assault Carbine

    The SIG SG 550 series has seen widespread use by special forces, regular army and security elements worldwide in its various forms.

     Updated: 5/9/2017; Authored By Staff Writer; Content ¬©www.MilitaryFactory.com

    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. Development of the new system began in 1979 and spanned into 1980. 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. 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. 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)".

    The SG 550 was developed into a family of automatic weapons, each born from the basic automatic action and intended to be inherently modular to produce specialized carbine, commando and sniper rifle forms. This benefitted prospective buyers by way of its logistically friendly design that could arm frontline, secondline and specialized forces units as needed - all sharing the same internal components, ammunition and function/training.

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    SIG SG 550 (Sturmgewehr Model 550) / Stgw 90 Technical Specifications

    Service Year: 1990
    Type: Assault Rifle / Assault Carbine
    National Origin: Switzerland
    Manufacturer(s): SIG-Sauer / Swiss Arms AG - Switzerland

    Design (Internal, Dimensions and Weights)

    Firing Action: Gas-Operated; Rotating Bolt
    Available Caliber(s): 5.56x45mm NATO
    Ammunition Count / Feed: 5-, 20- or 30-round detachable box magazine
    Overall Length: 998 mm (39.29 inches)
    Barrel Length: 528 mm (20.79 inches)
    Weight (Empty): 9.04 lb (4.10 kg)
    Sighting Assist: Iron Front and Rear; Optional Optics


    Muzzle Velocity: 2,989 feet/sec (911 m/sec)
    Rate-of-Fire (RoF): 700 rounds-per-minute (rpm)
    Typical Range: 1,312 feet (400 meters; 437 yards)

    Global Operators / Customers

    Argentina; Brazil; Egypt; France; Germany; India; Indonesia; Macau; Malaysia; Malta; Pakistan; Poland; Serbia; Slovakia; Spain; Switzerland; Turkey; United States

    Model Variants

    SG 550 - Swiss Designation; base production model.

    SG 551 - Carbine based on the full-length SG 550; 14.3-inch barrel; revised handguard; sans bipod; sans support for rifle grenades and bayonet.

    SG 551-1P - Police version of SG 551

    SG 551 "SWAT" - SWAT version of SG 551

    SG 551 LB ("Long Barrel") - 17.9-inch barrel; support for rifle grenades and bayonet.

    SG 552 "Commando" - Compact Carbine Form; 8.9-inch barrel; reworked internals; appearing in 1998.

    SG 552-2P - Police bersion of SG 552 Commando

    SG 552 LB ("Long Barrel") - Variant of SG 552 with 13.6-inch barrel; compatible with rifle grenades and bayonet.

    SG 553 - Improved SG 552; internals follow SG 550 models; 13.3-inch barrel; appearing in 2009.

    SG 553 LB ("Long Barrel") - 13.7-inch barrel; Picatinny rail; support for rifle grenades and bayonet.

    SG 550 "Sniper" - Dedicated marksman rifle form; two-stage trigger; 25.6-inch heavy barrel; sans iron sights; 5- or 20-round magazine; bipod; adjustable shoulder stock; new ergonomic pistol grip.

    Fass 90 - French Army Designation of SG 550

    Stgw 90 - German Army Designation of SG 550

    SG 550 "Sport" - Civilian Rifle Form

    SIG 556 - American Commercial Market Variant

    SIG 522LR - Chambered for the .22 cartridge; blowback operation.

    SG 550 SP - Civilian version of SG 550; semi-automatic fire only.

    SG 551 SP - Civilian version of SG 551; semi-automatic fire only.

    SG 552 SP - Civilian version of SG 552; semi-automatic fire only.

    PE 90

    SIG556 "Classic" - Slim profile variant; Picatinny rail.

    SIG556 DMR - 21-inch barrel; Magpul stock.

    SIGP556 - Pistol Variantl 10-inch barrel