Asking for a friend, obviously. He bought a TC Contender carbine in .223 from a friend and got with it an additional 10" .22 barrel, pistol grip and pistol for end. We know he can't put the 10" barrel on the rifle stocked receiver, it says so right on the butt. Can he take the receiver, remove stock and barrel, and replace them with the pistol stock and barrel? He has no idea whether this thing originally started out as one or the other.