Originally Posted by Bill DeShivs
M-2s converted to M-1 are still considered machineguns, under federal law.
Are you positive about that?
M-2 carbine had operating lever, and a modified sear with a lever arrangement for full automatic operation. For civilian sale, those features are removed by the gov't arsenals. I've examined many carbines, all had the M-1 sear, no M-2 modifications except the M-2 stock was reused. Occasionally I've seen the later model round bolt. The flattened bolt was also used with the M-2 carbine. Of course later remodification by individuals back to M-2 are completely illegal.