The Beretta Model 81 (Cheetah) is an Italian, double-action, blowback operated semi-automatic pistol first produced in 1976. The Model 81 is chambered in 7.65 mm ACPcalibre and fed by a 12-round box magazine. The Beretta Model 81 has a 97 mm long barrel. It is fitted with a blade foresight integral with the slide and a notched bar rearsight dovetailed to the slide. It has a nominal muzzle velocity of 300 meters per second. Research Beretta Model 81