Specifications for the
SIG SG 550 (Sturmgewehr Model 550) / Stgw 90
Assault Rifle / Carbine
Country of Origin: Switzerland
Manufacturer: SIG / Swiss Arms AG - Switzerland
Initial Year of Service: 1990
Overall Length: 998 mm (39.29 in)
Barrel Length: 528.00 mm (20.79 in)
Weight (Empty): 9.04 lb (4.10 kg)
Caliber*: 5.56x45mm NATO
Action: Gas-Operated; Rotating Bolt
Feed: 5-, 20- or 30-round detachable box magazine
Muzzle Velocity: 2,989 ft/sec (911 m/sec)
Rate-of-Fire: 700 rounds per minute
Range: 1,312 ft (400 m; 437 yds)
Sights: Iron Front and Rear; Optional Optics
* Listed caliber(s) for firearms may be model dependent if more than one model type/chambering was produced. Always consult official manufacturer's information or a licensed dealer.
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.
SIG556 "Classic" - Slim profile variant; Picatinny rail.
SIG556 DMR - 21-inch barrel; Magpul stock.
SIGP556 - Pistol Variantl 10-inch barrel
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