This is a WWII M1 carbine as manufactured by the Underwood company, that has been professionally converted into the desirable "Fully Automatic" M2 configuration. As noted above this carbine was converted/registered by John Norrell a well know class 2 manufacturer. The internal trigger housing and sear mechanism all appear to be original GI parts. The carbine itself has an original WWII version made by the Underwood company, the barrel is marked Underwood/Ordnance Bomb/1-44. It has all the late features, such as the type three barrel band, stamped adjustable rear sight, late M2 potbelly stock with four rivet hand guard with the round bolt made for fully automatic firing. It is complete with a reproduction canvas sling. As noted above this carbine is a fully transferable, automatic M2 carbine that is registered on a ATF Form 4, which carries the appropriate ATF tax stamp. So be sure to check with your local laws before you bid on this weapon.