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.45 ACP (Automatic Colt Pistol, 11.43 x 23 mm) is a rimless pistol cartridge designed by firearms designer John Browning in 1905, for use in his prototype Colt semi-automatic .45 pistol—a design which evolved into the M1911 pistol adopted by the U.S. Army in 1911.
The .45 ACP would become one of the most successful cartridges of all time, among both military and civilian users. It has been used in innumerable handguns and submachine guns (including most famously in the M1911 pistol) since its introduction.

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