The semi-automatic SIG SG 550 Sniper rifle has been developed in close
co-operation with the special units of the police. The basic concept relies on the assault rifle SG 550. The outstanding accuracy is based on the heavy hammer-forged precision barrel as well as the low recoil, gas-operated loading system with rotating bolt. The sensitive double-pull trigger and the possibility to fire in a very short time all have a favourable effect on the weapon's precision. The SG 550 Sniper rifle has been designed for caliber 5.56 mm (.223) ammunition which allows usage of the GP 90 cartridge of the Swiss army, an inexpensive cartridge with high performance and superior precision characteristics. 