The #M1911 is a single-action, semi-automatic pistol designed by John Browning and formally adopted by the U.S. military in 1911. Chambered for the .45 ACP cartridge, it served as the primary sidearm for the U.S. Armed Forces through much of the 20th century and remains popular today with military, law-enforcement, and civilian shooters because of its reliability, simplicity, and powerful cartridge. Key points Designer: John Browning. Year adopted: 1911 (hence the name). Caliber: .45 ACP (origin

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