Sorry for the newb question, but if I buy a complete KAC lower with a stock on it and then remove the stock (prior to installing any upper on it) and then put a pistol brace on it and then install a short barrel upper did I just make an SBR or do I have a pistol? I have always built stripped receivers so I wasn't sure what the law is regarding buying a complete lower that has never being mated with an upper.
Thanks!