The SIG SG 510 or Sturmgewehr 57 is a selective fire battle rifle manufactured by Schweizerische Industrie Gesellschaft now SAN Swiss Arms of Switzerland It uses a roller-delayed blowback system similar to the H K G3 and CETME rifles The SIG SG 510-1 entered service in the Swiss Army with the designation Fass 57 French Italian for Fusil d Assault 57 Fucile d Assalto 57 or Stgw 57