Developed in the 1960s, the short-lived Spitfire Carbine was an open bolt semi-automatic weapon that was found by the ATF to be readily convertible to full automatic. Retroactively declared a machine gun, most Spitfires were destroyed by their owners, with a limited number registered per the NFA. In appearance the Spitfire is made to look like the famous Thompson SMG, though the core action is essentially a tube gun version of the M3A1, including compatibility with the M3/M3A1's magazines. Blade front and peep rear sights, with a set of alloy pistol grips, manufacturer markings on the magazine well (with the original "SEMI-AUTO" marking untouched), and a fixed buttstock. Internal parts have been deleted to set the carbine into permanent full auto operation, with an aftermarket feed ramp and an M3A1 pattern bolt installed. Included with the lot are nine extra M3 magazines, a Spitfire pattern bolt, and some small parts.

Very fine, with 90% of the refinished blue, showing a number of light scratches and handling marks. The revarnished wood shows mild scuffs and dents. The safety is out of order, otherwise mechanically fine. 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.