The final wartime revision of the Thompson Submachine Gun, the M1A1 was on paper made obsolete by the M3/M3A1, but would continue to serve as late as the Vietnam War. This particular example has been effectively retrofitted back to the M1 standard, with an articulated firing pin equipped M1 bolt instead of the M1A1's fixed firing pin bolt. Blade front and fixed peep rear sights, with a horizontal handguard, and an "S" marked machined receiver with multiple military inspector marks (FJA, GEG) and "S-45" near the serial number. The trigger housing has dual control switches, a fixed buttstock, and a grooved pistol grip. Included with the lot are four extra stick magazines, two 3-celled canvas magazine pouches, and a copy of the 1928A1 field manual.