(210 mm) [1] Barrel length 5.03 in (127 mm), Government model; [1] 4.25 in (108 mm), Commander model; 3.5 in (89 mm), Officer's ACP model Cartridge .45 ACP Action Short recoil operation [1] Muzzle velocity 830 ft/s (253 m/s) Feed system 7-round standard detachable box magazine [1] The M1911 is a