this military collectible was lost when there was a work around either entry in the nfa registry as a transferable sbr or simple conversion to legal length numrich arms aka gun parts corp received a number as parts kits but the last time i checked more and more of the parts are marked sold out maybe not a big deal to hunters or wilderness hikers since there are the m and ar in civilian versions but for military collectors it means there are few examples of the m around it is like the stamp collectors why bother with glued paper when there's e mail