Originally manufactured by Standard Products as an M1 semi-automatic carbine, this item has been upgraded by Dillon Precision Products with a full set of M2 conversion components, turning it into a selective fire carbine. Introduced late in World War II, and later a signature weapon of the Korean War, the M2 achieved near maximum level parts commonality with the M1, allowing conversions at the field armorer level to meet unit needs and manufacturers to wait extremely late in the production process to decide if an arm would leave the plant as a M1 or an M2. Blade front and adjustable peep rear sights, an unmarked clamp-on muzzle brake on the "3-44" dated Underwood barrel, Type 3 bayonet lug, 4-rivet handguard, and an unmarked low wood "pot belly" M2 stock. The receiver is marked "20" and "Dillon Prec./Scottsdale, Az." on the left side under the stock, with a "SA" and "MA220" marked operating rod, "A" marked selector switch, unmarked transfer bar, round "A.I" bolt, milled Inland trigger housing, "M" marked M2 magazine catch, "SS" flip safety, "8" sear trip, "I-I" hammer, and an unmarked sear. Magazine absent.