SIG SG 550
| SIG SG 550 | |
|---|---|
SIG SG 550 adopted as the standard service rifle of the Swiss Army, designated as the Stgw 90 | |
| Type | Assault rifle Carbine Battle rifle Designated marksman rifle Semi-automatic rifle |
| Place of origin | Switzerland |
| Service history | |
| In service | 1990–present |
| Used by | See Users |
| Wars | War in Afghanistan (2001–2021) Sinai insurgency 2013 Lahad Datu standoff Yemeni Civil War (2014–present) |
| Production history | |
| Designer | Schweizerische Industrie Gesellschaft |
| Designed | 1970s–1980s |
| Manufacturer | SIG Sauer AG (formerly Schweizerische Industrie Gesellschaft and Swiss Arms) |
| Produced | 1986–present |
| No. built | 600,000 |
| Variants | See Variants |
| Specifications | |
| Mass | 4.1 kg (9.04 lb) |
| Length | 1,000 mm (39.4 in) (stock extended) 772 mm (30.4 in) (stock folded) |
| Barrel length | 528 mm (20.8 in) |
| Cartridge |
|
| Action | Gas operated, rotating bolt |
| Rate of fire | ~700 rounds/min |
| Muzzle velocity | 911 m/s (2,989 ft/s) |
| Effective firing range | 100–400 m sight adjustments |
| Feed system |
|
| 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) |
The SIG SG 550 is an assault rifle manufactured by SIG Sauer AG (formerly a division of Schweizerische Industrie Gesellschaft, now known as SIG Holding AG) in Switzerland. "SG" is an abbreviation for Sturmgewehr ("assault rifle"). The SG 550 was co-developed by Sig Sauer AG and Italian firearm manufacturer Beretta, and is based on the earlier predecessor, the SIG SG 540, chambered in 5.56×45mm NATO.