I certainly didn't mean to imply you were lacking facts. It was more a general commentary on internet lore of all these NFA prosecutions that never occurred or for the ones that did occur....were an additional charge as part of an larger criminal prosecution. That is not to say that NFA type cases do not exist, they certainly do, but typically not as a result from a FTB ruling. I think a Federal Prosecutor would be reluctant to build a case on a ruling/reversal/violation type scenario. Of course, stranger things have happened, but keep in mind, much of what is debated is a scenario where a citizen, not predisposed to criminal activity, knowingly and willfully possessed/constructed an NFA firearm in violation of law....I would argue that is a tough standard.
I understand that many opinions and views are shaped through experiences as dealers, which has no doubt causes tremendous resentment towards the BATFE (rightfully so in many case. Jon nailed it when he stated that you will get numerous different answers from as many different agents. It is frustrating even for those that are not FFLs, but highlights that Federal Firearms Laws are (or at least can be) as complicated as the tax code.