SIG-510

A selective fire battle rifle developed by Schweizerische Industrie Gesellschaft (SIG) during the Cold War. Also known as the Sturmgewehr 57 (Stgw 57), it entered service with the Swiss Army in 1957, remaining in inventory until 1990. Operating on a roller-delayed blowback mechanism, and using a 24-round box magazine, the SG 510 is capable of firing at a rate up to 600 rounds per minute with an effective firing range of 800 meters. SIG 510 was originally chambered with the 7.5×55mm GP 11 cartridge, though later variants intended for Chile and Bolivia were developed to chamber 7.62x51mm NATO cartridges. The forearm grip of the SG 510 is located near the receiver group, with a bipod integrated into the weapon near the muzzle. It includes a muzzle break to reduce recoil, and can also mount a bayonet or launch rifle grenades. The fixed butt-stock is integrated with a buffer unit to further reduce the recoil. After retiring from service many SG 510 units were refitted to only fire semi-automatic and sold to civilian market, intended for firearms enthusiasts, hunters and sport marksmen alike.