^^THIS. Secondhand is not the best way to get your info especially if you're passing it on. Pick your battles. Every one can't be won but resources can be wasted trying toOh my that was painful to try to watch. Just put a link to actual ATF legit document.
i am 100% 2a. If this is true and you did not see something coming? If it walks like a duck, quacks like a duck it must be a duck. Do you want to leave it up to some bureaucratic jack leg to tell the difference between theses devices.
braces, bump stocks, binary triggers and such is just flirting with disaster. Save your capital energy and fight for when they come to take your Glock 17 or M4 AR.