7.62x51mm NATO 7.62x54mmR (See also Zastava M91 ) Specifications Weight 4.6 kg (9lb 5.6oz) Length 1135 mm (44.68 in) Barrel length 550 mm (21.65 in) Cartridge 7.92x57mm IS Mauser Action Gas-operated Rate of fire Semi-automatic Muzzle velocity 730 m/s (2,395 ft/s) Effective range 800+ m (875+ yards) with optics [1] Feed