if said gun is a prohibited barrel length , not registered in the current system it goes for destruction. the longer barrel would have to be on it. before it sees the light of day. to get it into the new systemTheoretically, if somebody were to find a woodwork find, in the soldiers family luger, that was "taken and cleaned by the military, then returned to family" in the 1960's (sounds like entered into a registry to me) and if a deal could be worked out, what would one do? Have it shipped to the gunsmith by the family? Would they even touch it for re-barrel and re-class if it was not registered somewhere?