The Beretta model 84 Cheetah is a blow-back operated semi-automatic pistol chambered for the .380 ACP cartridge. It has a four inch barrel, feeds from a 13 round magazine and has an ambidextrous frame-mounted De-cock/safety. The frame is alloy. It is available in both black and satin nickel finishes, with plastic or wood grips. Blowback is a system in which automatic or semi-automatic firearms operate through the energy created by combustion in the chamber and bore acting directly on the bolt face through the cartridge. ... Springfield Armory M1911A1 . ... Yugoslavian 9 mm Kratak (9 mm Short) cartridges, FMJ. The . ... This article or section does not adequately cite its references or sources. ... A decock/safety allows the hammer to be dropped on a live cartidge without discharging, via disengaging, retracting or covering the firing pin. ...