That's the real murky part of all of it. I want to build a 16" mid length and one of the $279.00 PSA 10" pistol kits. I have 2 lowers as of today and lots of spare parts. Nothing is assembled and I don't have ANY upper parts yet. But what if ...IF I had said 10" upper laying in the parts tub with my Magpul fixed rifle stock? Not assembled in any way. Just a big Rubbermaid tub of parts. To me it's way too easy for the Man to get you when it comes to ARs.So what if someone has a completed AR pistol with overall length of less than 26", and they also have a vertical fore grip but it's NOT mounted and just sitting in a drawer someplace. Could they be prosecuted for constructive intent of an AOW?