Produced by the American Automatic Weapons Company and named after General Thompson of the United States, the M1 submachine gun was improved and developed by the M1928A1 in 1942, and the M1A1 submachine gun was subsequently improved.

11.43 caliber automatic gun type, using 11.43 Colt automatic pistol cartridge, effective range 200 meters, full gun length 811 mm (0.8 m), barrel length 267 mm (0.267 m), total weight without magazine 4.78 kg, can be equipped with 20 rounds, 30 rounds, 50 rounds, 100 rounds.