The United States Submachine Gun, Cal. .45, M1A1, or Thompson, was adopted in October of 1942, only six months after the M1 Thompson was adopted, both of these were simplifications of the M1928 Thompson. Chambered for the .45 ACP cartridge, it uses a blowback design and fires from the open bolt with a 600-700 rounds per minute rate of fire. At its low, in 1944, the M1A1 cost the U.S. government $45, that was down from over $200 in 1939. While it was officially replaced by the M3 "Grease Gun" by the end of WWII, the Thompson would continue to see U.S. service into Vietnam.

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