How is this not a violation? US M1 Carbine Disconnector, Lever, selector. | eBay If the parts kit is considered a machine gun would not the majority of the parts in a kit also be considered to be NFA items? Just asking because with those parts and a few min with my milling machine or a drill press and good vice I could modify the hammer to M2 spec's. the only other work required is to open up the stock a little for clearance and to make a very simple spring.