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The M1A1 Thompson submachine gun on display at the Virginia War Museum. The M1A1, standardized in October 1942 as the United States Submachine Gun, Cal. .45, M1A1, could be produced in half the time of the M1928A1, and at a much lower cost. The main difference between the M1 and M1A1 was the bolt.
The caliber (CAL .45, CAL .30, or CAL .50) was painted in bold lettering in the upper left corner. The gross weight of the box in pounds and its volume in cubic feet was painted in the lower left corner and the Ammunition Lot information (manufacturer code and lot number) was painted in the lower right corner.
In firearms, a blowback system is generally defined as an operating system in which energy to operate the firearm's various mechanisms, and automate the loading of another cartridge, is derived from the inertia of the spent cartridge case being pushed out the rear of the chamber by rapidly expanding gases produced by a burning propellant, typically gunpowder. [3]
Auto-Ordnance Corporation was created by John T. Thompson in August 1916 with the backing of investor Thomas Ryan. In 1915 Thompson had found the Blish Lock patent of Commander John Blish, which was the operating principle of the first prototypes of the Thompson submachine gun and the Thompson Autorifle. In exchange for shares of the newly ...
Thompson submachine gun (France ordered 3000 Thompsons due to shortages of SMGs during invasion. Used by French Liberation Army) [177] [174] [173] [178] MP 18 (Some were in inventory in 1939. Limited use) [43] Suomi K/P-31 (150 SMGs seized from surrendering Republicans after the Spanish civil war) [179] Sten submachine gun (British aid)
World War I began in Europe in 1914, and Thompson was sympathetic to the Allied cause. Since the U.S. did not immediately enter the war, and because he recognized a significant need for small arms in Europe (as well as an opportunity to make a substantial profit), Thompson retired from the Army in November of that year and took a job as Chief Engineer of the Remington Arms Company.
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The United Defense M42, sometimes known as the Marlin for the company that did the actual manufacturing, was an American submachine gun used during World War II.It was produced from 1942 to 1943 by United Defense Supply Corp. for possible issue as a replacement for the Thompson submachine gun and was used by Office of Strategic Services (OSS) agents. [1]