I'll be the first to admit that I don't know much about class 3 stuff. I want to make sure that I stay within the law because I don't want any trouble coming my way. I bought a spikes stripped lower and I put the lpk in and I put a stock on it. It has never had any upper on it yet. What are my options? Can I sell the stock and put a pistol stock on it and do an ar pistol now or since I have a rifle stock on it now I am limited to only a 16" upper? I may later down the road look into a sbr but right now I want to make sure I am 100% legal and within the law.. Any advice is appreciated. Thanks guys!