The Thompson submachine gun is one of the most iconic American firearms in history. The Auto-Ordnance M1A1 is the semi-automatic reproduction of the WWII-standard M1A1 configuration, the simplified version of John T. Thompson's original design manufactured for wartime production speed. The original Thompson M1928 used by gangsters and Prohibition-era law enforcement gave way to the M1 and M1A1 variants with simpler construction. Auto-Ordnance (owned by Kahr Arms) produces semi-automatic reproductions for the civilian market in both M1 and M1928 configurations. The "Tommy Gun" remains one of the most recognizable American firearms of the 20th century. Type: Rifle Action: Semi-Automatic Caliber: .45 ACP Capacity: 30 Year introduced: 1942, USA Weight: 256 oz Overall length: 31.9" Status: Active Military use: Yes Intended use: collector, historical