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The .45 ACP (Automatic Colt Pistol), also known as .45 Auto, .45 Automatic, or 11.43×23mm [1] is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol.
The .45 ACP (not to be confused with .45 Colt) cartridge is a very popular caliber due to its low velocity and relatively high stopping power.This caliber is associated most with the Colt M1911, logically, as ACP literally means 'Automatic Colt Pistol'.
Diagram of .45 Colt U.S. Army "ball cartridge" for Army M1909 revolver, with dimensions in inches. The .45 Colt was a joint development between Colt's Patent Firearms Manufacturing Company (now known as Colt's Manufacturing Company), of Hartford, Connecticut, and the Union Metallic Cartridge Company (UMC) of Bridgeport, Connecticut.
The Colt M1911 (also known as 1911, Colt 1911, Colt .45, or Colt Government in the case of Colt-produced models) is a single-action, recoil-operated, semi-automatic pistol chambered for the .45 ACP cartridge. [10]
Colt has manufactured several self-loading pistols. The first was the Colt M1900 made from 1900 to 1902 exclusively for the .38 ACP. The Colt Model 1903 Pocket Hammer was manufactured for the same .38 ACP cartridge from 1902 to 1928. The M1905 military pistol was manufactured for the .45 ACP cartridge from 1905 to 1912.
The Colt Model 1910 was a prototype .45 ACP caliber automatic pistol developed by John Browning as an improvement of the earlier Colt Model 1909, which was rejected by the United States Department of War due to the Cavalry's belief that the design was too complicated for use by enlisted men, and because it lacked a safety mechanism.
The Colt Officer's Model or Colt Officer's ACP is a single-action, semi-automatic, magazine-fed, and recoil-operated handgun based on the John M. Browning designed M1911. It was introduced in 1985 as a response from Colt to numerous aftermarket companies making smaller versions of the M1911 pistol.
In addition, Ace Custom .45's Inc. of Cleveland, Texas, trademarked the .45 Super name in 1994 and used to market factory .45 Super pistols, as well as gunsmith adaptations of .45 ACP pistols, and .45 ACP conversion kits. Ace Custom .45's Inc has since gone out of business and their website is down. [8] Texas Ammunition, Underwood Ammo, [9] and ...