namedpipes
NES Member
I fear that the biggest problem with "ghost guns" is anti-gunners pushing harder for a total ban instead of recognizing that bad guys will always find a way. There's nothing to stop low-budget bad guys from buying an old Bridgeport for $1500, cranking out lowers and reinvesting the profits until they have several CNC machines running. Basement shops could pop up in every town like meth labs and then more hysteria and more laws.
Or set up as an ffl/07 and do the same thing above board.
Assuming one is not already a prohibited person, the only additional overhead is a couple license fees and a suitably zoned address. Depending on your state of residence, of course. MA throws a few more rules at you.