Introduced late in World War II, the M2 Carbine was designed to work both as a factory-made machine gun as well as an armorer upgrade to the extant M1 carbine; this flexibility allowed armorers and arsenals to rapidly swap M1 and M2 components as needed to fulfill TOE requirements. This example left the United States at some point and re-entered the country via Interarms, with their mark present on the right side of the barrel. "R" marked blade front and "PI" marked adjustable rear sights, Inland "4-45" barrel, and a factory original "M2" model marking on the receiver ring. Fitted with an "AI" marked round bolt, Inland milled trigger housing, "H.I." hammer and selector switch, "Q" operating rod, "E.I" flip safety and M2 magazine catch, with the other internal components unmarked. Installed in a low wood pistol grip stock with a 2-rivet upper handguard.