True, it may be more of an opinion determined by some paper pushing A$shole. But.......
1 - Who would want to be the one to break the ice going up against the ATF challenging it?
2 - If it went sideways and you lose the battle, is it really worth being deemed a felon and having them confiscate the rest of your weapons? Just for laying a pistol brace against your shoulder?
Not this guy. I've already got too many $'s tied up in NFA stuff as it is, besides all of the other stuff that I have. Besides, that's why I have SBR's to begin with.
I'm not trying to argue it. But once you dip into the NFA end of the pool, you tend to be a little more broader thinking, and a little more defensive. At least I do. Mainly....because of the $hitheads.