M1911A1

United States Pistol, Caliber .45, M1911
A Remington Rand-made Model 1911A1 of the U.S. Army
Type	Semi-automatic pistol
Place of origin	United States
Service history
In service	1911–present
Used by	28 nations, see Users below for details
Wars	As standard U.S. service pistol: World War I World War II Korean War Vietnam War In non-standard use: Irish war of independence Indonesian National Revolution Persian Gulf War War in Afghanistan Iraq War Syrian Civil War
Production history
Designer	John Browning
Designed	1911 and 1924 (A1)
Manufacturer	Colt Manufacturing Company
Produced	1911–present
No. built	Over 2.7 million
Variants	M1911A1 M1911A2 RIA Officers
Specifications
Weight	2.44 lb (1.105 kg) empty, w/magazine
Length	8.25 in (210 mm)
Barrel length	Government model: 5.03 in (127 mm) Commander model: 4.25 in (108 mm) Officer's ACP model: 3.5 in (89 mm)
Cartridge	.45 ACP
Action	Short recoil operation
Muzzle velocity	825 ft/s (251 m/s)
Feed system	7 round standard detachable box magazine

The M1911 is a single-action, semi-automatic, magazine-fed, recoil-operated pistol chambered for the .45 ACP cartridge. It served as the standard-issue sidearm for the United States Armed Forces from 1911 to 1986. It was first used in later stages of the Philippine–American War, and was widely used in World War I, World War II, the Korean War, and the Vietnam War. The pistol's formal designation as of 1940 was Automatic Pistol, Caliber .45, M1911 for the original model of 1911 or Automatic Pistol, Caliber .45, M1911A1 for the M1911A1, adopted in 1924. The designation changed to Pistol, Caliber .45, Automatic, M1911A1 in the Vietnam War era.

The U.S. procured around 2.7 million M1911 and M1911A1 pistols in military contracts during its service life. The M1911 was replaced by the 9mm Beretta M9 pistol as the standard U.S. sidearm in October 1986, but due to its popularity among users, it has not been completely phased out. Modernized derivative variants of the M1911 are still in use by some units of the U.S. Army Special Forces, the U.S. Navy and U.S. Marine Corps.

Designed by John Browning, the M1911 is the best-known of his designs to use the short recoil principle in its basic design. The pistol was widely copied, and this operating system rose to become the preeminent type of the 20th century and of nearly all modern centerfire pistols. It is popular with civilian shooters in competitive events such as USPSA, IDPA, International Practical Shooting Confederation, and Bullseye shooting. Compact variants are popular civilian concealed carry weapons in the U.S. because of the design's relatively slim width and stopping power of the .45 ACP cartridge.