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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 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 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 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]
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).
The .45 ACP caliber was chosen and improved upon with the high velocity, high pressure 185 gr (12.0 g) +P loading. [17] The OHWS pistol had to fire many types of rounds in addition to the +P cartridge and have a long service life with the high pressure ammo. The M1911 had been proven in service for over 70 years, but was rejected. High pressure ...
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.
A rebuild entails discarding almost all of the gun's parts except for the frame, which prior to 2003 was a U.S. Government frame last manufactured in 1945. [10] The frame is inspected and reused if it is still within military specifications. [10] [11] There are frames in the USMC inventory that have had as many as 500,000 rounds fired through ...