A Thompson M1A1 is a select fire submachine gun from Earth. It was one of earlier automatic weapons in Earth history. An alternate Lt. Colonel Mitchell travelled back in time to stop Ba'al from altering the future where he would conquer the Earth. Andrew Chittock/Stocktrek Images – Thompson Model M1A1 Submachine Gun. Photo Print (88,39 x 58,42 cm) Title: Thompson Model M1A1 submachine gun.
For WWII, approximately 1,700,000 Thompson Submachine Guns were produced by Auto-Ordnance and Savage Arms, with 1,387,134 being the simplified World War II M1 and M1A1 variants (without the Blish lock and oiling system).