The Probert Encyclopaedia of Warfare

SIG SG 57

The SIG SG 57 (Stgw 57) was a Swiss delayed blowback operated automatic rifle introduced in 1957. The SIG SG 57 was chambered for the 7.5 mm Swiss M1911 cartridge which it took from a 24-round box magazine and fired with a muzzle velocity of 760 meters-per-second and a cyclic rate of 475 rpm. The SIG SG 57 was used by the Swiss defence forces and also exported under the designation SIG SG 510.
Research SIG SG 57