| SIG SG 551 (STGW 90) | |||
| Length: | |||
| Country Of Origin: | Switzerland | Stock Extended: | 825 mm |
| Designation: | Automatic Rifle | Stock Retracted: | 772 mm |
| Cartridge: | 5.56 x 45 mm NATO | Barrel: | 405 mm |
| Production Date: | 1986- | Weight: | 3.5 kg |
| Rifling: | 6 grooves, rh | ||
| Mag Capacity: | 20 or 30 rounds | ||
| Rate Of Fire: | 700 rds/min | ||
SIG 551 - shortened version of the 550
Sig551 is "carbine" - shortened version of the Stg.90. The differences are a shorter barrel and no bipod and bayonet mount. A "super-short" semi-auto version Sig552 "Commando", with barrel lenght of 254mm is also offered.