SIG SG 550

The SG 550 is an assault rifle manufactured by Swiss Arms AG (formerly Schweizerische Industrie Gesellschaft) of Neuhausen, Switzerland. "SG" is an abbreviation for Sturmgewehr, or "assault rifle". The rifle is based on the earlier 5.56mm SG 540 and is also known as the Fass 90 (Fusil d'assaut 90/Fucile d'assalto 90) in French/Italian or Stgw 90 in German (Sturmgewehr 90).

SIG SG 550
Class Manportable
Type Rifles
Manufacturer Swiss Arms
Origin Switzerland
Country Name Origin Year
Switzerland 1990
Country Name Operational Year Retirement Year
Argentina View
Brazil View
Canada View
Denmark View
Egypt View
Finland View
France View
Germany View
India View
Indonesia View
Malaysia View
Netherlands View
Poland View
South Korea View
Spain View
Switzerland 1990 View
Tunisia View
Turkey (Ottoman Empire) View
Turkey (Ottoman Empire) View
United Kingdom - UK (Great Britain) View
United States of America View
Vatican (Papal States) View
Yugoslavia (Serbia) View
Slovakia View
Malta View
ManufacturerName Production From Production To Quantity
Schweizerische Industrie Gesellschaft (SIG) 1986 View
Swiss Arms 1986 600000 View

In 1978, the Swiss Army formulated requirements for a successor to the Stgw 57 battle rifle (known commercially as the SG 510) using the 7.5×55 mm Schmidt–Rubin 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, commanding staff, vehicle crews, special operations 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 6.45×48 mm and 5.6×45 mm cartridges) and the SG 541 (developed by SIG). In 1981, the experimental 6.45 mm GP 80 cartridge was rejected in favor of the more conventional 5.6×45 mm GP 90 round (with a 4.1 g, tombac-jacketed, lead core projectile) that is the Swiss equivalent to NATO's standard 5.56×45 mm cartridge.

Type Assault rifle
Place of origin Switzerland
Service history
In service 1990–present
Used by See Users
Wars 2013 Lahad Datu standoff
Production history
Designer Schweizerische Industries Gesellschaft
Designed 1970s
Manufacturer Swiss Arms AG (formerly Schweizerische Industrie Gesellschaft)
Produced 1986–present
Number built 600,000+
Variants See Variants
Specifications
Weight SG 550: 4.1 kg (9.04 lb)
SG 551: 3.40 kg (7.5 lb)
SG 552 Commando: 3.2 kg (7.1 lb)
SG 553: 3.2 kg (7.1 lb)
SG 550 Sniper: 7.02 kg (15.5 lb)
Length SG 550 (stock extended): 998 mm (39.3 in)
SG 550 (stock folded): 772 mm (30.4 in)
SG 551 (stock extended): 833 mm (32.8 in)
SG 551 (stock folded): 607 mm (23.9 in)
SG 552 Commando (stock extended): 730 mm (28.7 in)
SG 552 Commando (stock folded): 504 mm (19.8 in)
SG 553 (stock extended): 730 mm (28.7 in)
SG 553 (stock folded): 501 mm (19.7 in)
SG 550 Sniper (stock extended): 1,130 mm (44.5 in)
SG 550 Sniper (stock folded): 905 mm (35.6 in)
Barrel length SG 550: 528 mm (20.8 in)
SG 551: 363 mm (14.3 in)
SG 552 Commando: 226 mm (8.9 in)
SG 553: 227 mm (8.9 in)
SG 550 Sniper: 650 mm (25.6 in)
Cartridge 5.56×45 mm NATO (5.6 mm Gw Pat 90)
Action Gas operated, rotating bolt
Rate of fire Approx. 700 rounds/min
Muzzle velocity SG 550: 911 m/s (2,989 ft/s)
SG 551: 850 m/s (2,788.7 ft/s)
SG 552 Commando: 725 m/s (2,378.6 ft/s)
SG 550 Sniper: 940 m/s (3,084.0 ft/s)
Effective firing range 100–400 m sight adjustments
Feed system 5-, 20-, or 30-round detachable box magazine
Sights Rear: rotating diopter drum with tritium night inserts; front: hooded post with folding night post
540 mm (21.3 in) sight radius (SG 550)
466 mm (18.3 in) sight radius (SG 551)

End notes