Switzerland. Canton Ticino. Cureglia. Società Tiratori del Gaggio. Ivan Triacca is cleaning his weapon after a shooting practice. 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 or Stgw 90. An assault rifle is a selective-fire rifle that uses an intermediate cartridge and a detachable magazine. 23.09.2017 © 2017 Didier Ruef