Automatic Colt Pistol

Rimless .380 ACP cartridge

Automatic Colt Pistol (ACP) denotes various John Moses Browning cartridge designs primarily used in Colt and Fabrique Nationale de Herstal semi-automatic pistols.[1] All of these cartridges are straight-sided and appear similar. The .32 ACP, .38 ACP, and .25 ACP are semi-rimmed and headspace on the rim, while the rimless .45 ACP and .380 ACP headspace on the mouth of the case.[2]

  1. ^ Dockery, Kevin (2007). Future Weapons. Berkley Trade. p. 139. ISBN 978-0-425-21750-4. his agreement with Colt resulted in a number of cartridges being identified by the letters ACP, for Automatic Colt Pistol
  2. ^ Wilson, R. K. (1943). Textbook of Automatic Pistols. Plantersville, SC: Small Arms Technical Publishing Company. pp. 229, 234, 241, 254, and 258.