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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]
In 1911, a commission recommended adoption of the semi-automatic .38 ACP caliber Colt Military Model 1902 pistol, after field trials with 25 such pistols, all purchased from Colt's London Agency. However, as the US had just adopted the Colt .45ACP M1911 pistol it was decided to conduct further tests.
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 U.S. Army Model 1917 was created to supplement insufficient stocks of M1911 pistols during World War I. [2] The Colt M1917 Revolver was a New Service with a cylinder bored to take the .45 ACP cartridge and the half-moon clips to hold the rimless cartridges in position. Later production Colt M1917 revolvers had headspacing machined into the ...
The cartridge-pistol combination was quite successful but not satisfactory for U.S. military purposes. Over time, a series of improved designs were offered, culminating in the adoption in 1911 of the "Cal. 45 Automatic Pistol Ball Cartridge, Model of 1911", a 1.273-inch-long (32 mm) round with a bullet weight of 230 grains (15 g).
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 ...
Various firearms used by the United States military during World War II, displayed at the National Firearms Museum in Fairfax County, Virginia. The following is a list of World War II weapons of the United States, which includes firearm, artillery, vehicles, vessels, and other support equipment known to have been used by the United States Armed Forces—namely the United States Army, United ...
The Remington 1911 R1 is a semi-automatic pistol modeled after the classic Colt 1911 which has served the US armed forces for over 100 years. Like the Colt 1911, the Remington 1911 is single action only, and has a grip safety and a manually operated thumb safety ; it also has a Colt Series 80 style firing pin safety .