Manufactured concurrently with the M1, Winchester would produce carbine receivers with the model number left unstamped and strike them with the "1" or "2" as appropriate later in production depending on their needs. Blade front and "HI" adjustable rear sight, with an undated "W" barrel, "AI" Type III barrel band, round bolt, milled trigger guard, "SS" safety switch, and an unmarked M2 magazine catch. The selector hardware is installed, with the "A" marked selector switch on the left side of the receiver near the chamber. Fitted with a "perch belly" low wood M2 stock with a four-rivet handguard, green canvas sling and a checkered steel buttplate.