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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'. However, there are many more guns and variations on the M1911 that are chambered in .45 ACP.
The pistol's formal U.S. military designation as of 1940 was Automatic Pistol, Caliber .45, M1911 for the original model adopted in March 1911, and Automatic Pistol, Caliber .45, M1911A1 for the improved M1911A1 model which entered service in 1926. The designation changed to Pistol, Caliber .45, Automatic, M1911A1 in the Vietnam War era. [10]
Originally intended for high-ranking military personnel, the M15 was built from an existing stock of Colt M1911 pistols. [2] It is similar to the Colt Commander, but has internal differences. Colt later released a similar pistol called the Colt Officer's ACP. This model is commonly referred to as the "Officer".
The HK45 was designed to meet requirements set forth in the U.S. Military Joint Combat Pistol program [1] which had the purpose of arming the U.S. Military with a .45 ACP semi-automatic pistol instead of the 9mm M9 pistol. Heckler & Koch developed the HK45 with the help of retired SFOD-D operator Larry Vickers and firearms instructor Ken ...
The M1917 was also popular on the civilian and police market. Some were military surplus, while others were newly manufactured. Smith & Wesson kept their version in production for civilian and police sales until they replaced it with their Smith & Wesson Model 22 in 1950. A .45 AUTO RIM cartridge (left) compared to a .45 ACP cartridge (right).
Models in use included the M1911A1 (Colt .45 Automatic), Smith & Wesson (Combat Masterpiece in .38 Special caliber), Smith and Wesson Model 1917 (.45 ACP and .45 Auto Rim) and various other small arms. By the 1970s it became obvious that the M1911A1 (Colt Government .45ACP) model was going to have to be replaced. [4]
The FP-45 Liberator is a handgun manufactured by the United States military during World War II for use by resistance forces in occupied territories. The Liberator was never issued to American or other Allied troops, and there are few documented instances of the weapon being used for its intended purpose; this was compounded by the intended recipients – irregulars and resistance fighters ...
The FNP-45 Tactical was developed to be entered into the Joint Combat Pistol from late 2005 to early 2006 for a new military sidearm to replace the M9 Pistol. The program was started in 2005 and run by USSOCOM which was a merger of two earlier programs, the army's Future Handgun System (FHS) and the Special Operations Forces Combat Pistol.