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Shouldering a Sig Brace requires a form 1 - ATF

The ATF released an OPEN LETTER ON THE REDESIGN OF “STABILIZING BRACES”.  What does that mean to those of us who have a sig-braced pistol AR?

Any person who intends to use a handgun stabilizing brace as a shoulder stock on a pistol (having a rifled barrel under 16 inches in length or a smooth bore firearm with a barrel under 18inches in length) must first file an ATF Form 1 and pay the applicable tax because the resulting firearm will be subject to all provisions of the NFA. 

So, if you carry a pistol AR15 with a SIG brace, that is perfectly legal, but the second you shoulder mount it you are in possession of an SBR by rules covered by the rules of the NFA.  What does that mean?  Either start carrying an SBR or take the brace off your AR15 pistol for the time being until you get it Form 1'd from the ATF.  Then it'll be a pistol until you shoulder it, then it becomes a rifle. 

Makes perfect sense, right? A special thanks goes out to every person who sent the ATF completely stupid and moronic letters effectively poking the bear for no reason other than complete and utter stupidity.  Thank you.