The

.45 ACP The .45 ACP ( Automatic Colt Pistol) or .45 Auto (11.43×23mm) is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol. After successful military trials, it ...

(not to be confused with

.45 Colt The .45 Colt (11.43×33mmR), is a rimmed, straight-walled, handgun cartridge dating to 1872. It was originally a black-powder revolver round developed for the Colt Single Action Army revolver. This cartridge was adopted by the U.S. Army in 1 ...

) 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'. However, there are many more guns and variations on the M1911 that are chambered in .45 ACP. This list does not list all of them, just ones that have links to pages on Wikipedia, for further inquiry.

References

World Guns
*Guns Recognition Guide ''Terry Gander, May 2005, '' *Illustrated Directory of 20th Century Guns ''David Miller, June 2003, '' *Jane's Gun Recognition Guide ''Richard D. Jones, June 2008, {{ISBN, 0061374083'' .45 caliber handguns