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Automatic Colt Pistol The Model 1911 pistol was developed for the Army. Most bullets (cartridges) had a large base for use in the cylinder of a revolver. The Colt pistol was automatic and used a clip so the cartridge did not have a base that was wider than the bullet. This bullet was specially designed for this gun. It became known as the .45 ACP so it would not be confused with other bullets.
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