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. Blade front and fixed peep rear sights, with a horizontal handguard, and an "S" marked machined receiver with multiple military inspector marks (FJA, GEG). The matching numbered trigger housing has dual control switches, a fixed buttstock, and a grooved pistol grip. Internals are M1A1 pattern, with a fixed firing pin on the bolt face and no provision for a Blish lock or oiler. Magazine absent.

Excellent, with 97% of the original combination blue and parkerized finish, showing some mild takedown/handling wear, bright edges and a few hints of brown patina. The furniture is very fine, with mild scratches and dings overall, and a few small chips concentrated at the toe of the buttstock. Mechanically excellent. NOTE: This weapon is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) that is classified as a "Curios or Relic" as defined in 27 CFR, 478.11. These weapons are still subject to the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 479.