The Thompson M1A1 was the simplified WWII variant of the iconic Thompson submachine gun. Removed the Blish lock, Cutts compensator, and finned barrel of earlier models to reduce cost and production time. Standard issue to NCOs, paratroopers, and tank crews. Type: Submachine Gun Action: Delayed Blowback Caliber: 45 ACP Capacity: 20 Year introduced: 1942, USA Weight: 10.8 oz Overall length: 32" Status: Discontinued Military use: Yes Intended use: Military, Collector, Historical