Oh, I agree it's dangerous to speculate on interpretation of laws, no argument there! I'm not trying to cause panic or anything, I just passed along some answers to questions that I hadn't heard asked. Before I got my FFL last year, I asked a ton of questions from other FFLs, namely, what things were potentially ass-biters that FFLs and gun-owning folks should look out for. I was referred to the BATF ruling in Feb. '86 that possession of an AR15 type rifle along with an M16 bolt carrier or an M16 hammer, or an M16 switch & dis-connecter constituted a machinegun. Possession of an autosear was not required. BATF knew that the hammer and the carrier were the critical parts to a full-auto conversion, and ruled accordingly. That's scary! I have a pre-ban Oly Arms AR-15, that was using a few M-16 parts, so I replaced them as time and money permitted, just to prevent the question even being asked of me at the range or elsewhere. But it's a gamble, if we had O.J.'s Dream Team of lawyers if it came to an arrest because of the parts, perhaps those technicalities wouldn't be so important, you're right.