This automatic carbine was remanufactured/produced by Rock Island Armory Incorporated of Geneseo, Illinois, chiefly using military surplus M1 components. The receiver is Underwood, originally an M1 with an overstruck "2" on the receiver ring. Unmarked blade front and "JAO" adjustable rear sights, with a Winchester barrel ("RIA" mark added to right side of chamber), "MMQ" Type III barrel band, "SS" flip safety, unmarked M2 magazine catch, "SG" recoil plate, unmarked low wood stock with "IO" 4-rivet handguard, "SG" operating rod, cast trigger housing with no legible markings, "7161837" auto sear, and a round "A.I." bolt. Two magazines, an "IS" marked M1 and a "J" marked M2, are included.