Neo035 ditches the airsoft gun to get his hands on the real deal Thompson M1A1 which he fires in slow motion. The airsoft replica is popular amongst collectors, the Thompson submachine gun, a 1920 invention by American John T. Thompson, was a formidable weapon weighing nearly 10 pounds and firing powerful .45-caliber ammunition. Its signature feature was either a drum magazine holding 50 or 100 rounds or a box magazine for 20 or 30 rounds.