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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.
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 ...
M1A1 Thompson submachine gun. Model of 1921 Thompson; Model of 1928 and M1928A1 Thompson; M50 and M55 Reising; M1 and M1A1 Thompson; M3 and M3A1; Heckler & Koch MP5 (some variants) Machine guns M60 7.62mm machine gun. M1895 Colt–Browning machine gun; Hotchkiss M1909 Benét–Mercié machine gun; M1917 Browning machine gun; M1918 Browning ...
The M1A1 was designed in May 1942 for paratrooper units, and came with a folding stock, but was otherwise identical to a standard M1. [118] M1A1 carbines were made by Inland, a division of General Motors and originally came with the early "L" nonadjustable sight and barrel band without bayonet lug.
Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR , Roessler Titan or Blaser R8 .
Thompson M1928 and M1A1 (Used by Greek Armed Forces in the Middle East) [333] Sten submachine gun (Used by partisans) [333] United Defense M42 (Used by partisans. Received from OSS) [333] Beretta M1938 (Captured from the Italians) [333] MP 40 & MP 41 (Captured from the Germans) [333]
In the simplified WWII M1 Thompson re-design, the Blish locking block was removed without substantial change to the gun's function with the .45 ACP cartridge. The Blish principle did provide delay in the Thompson prototypes using the .45 Remington–Thompson and .30 Carbine cartridges which generate higher pressure than the .45 ACP, a pistol round.
The M1A1 Common variant included adaptations for deep wading and improvements to increase commonality with the Army's Abrams. The 2nd Tank Battalion was equipped with M1A1HA Abrams borrowed from the Army. [60] The M1A1 was superior to Iraq's Soviet-era T-54/T-55 and T-62 tanks, as well as T-72 versions imported from the Soviet Union and Poland ...