The original Thompson submachine gun design adopted by the military, featuring the Cutts compensator, finned cooling barrel, and option for 50-round drum magazine. An iconic piece of American WWII history. Type: Submachine Gun Action: Automatic Caliber: .45 ACP Capacity: 50 Year introduced: 1921, USA Weight: 345.6 oz Overall length: 33.7" Status: Discontinued Military use: Yes Intended use: Close Quarters, Military, Law Enforcement