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.