NEW/Unfired Colt M4LE marked complete lower, originally a 6933 taken OFF the NFA SBR registry. It comes with the ATF letter stating such, factory new and factory built.
Not many of these out there and it takes several months to get ATF to take one off of the registry! You can have a Semi auto Colt M4 marked as such. Marked M4 and restricted mil/le use only.