The Sig Brace Saga is over. ATF issued a new determination.
http://gearscout.militarytimes.com/2015/01/16/breaking-atf-closes-arm-brace-sbr-loophole/
"The Firearms and Ammunition Technology Division (FATD), Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) has received inquiries from the public concerning the proper use of devices recently marketed as “stabilizing braces.”
This is the very reason why - when BATFE issues a letter to an individual - you don't write the Technology Branch and ask about YOUR specific situation. You shut your mouth, don't write in $hit, and roll with the determination that's been made. You don't write in, and start asking weird $hit, and hypothetical $hit, and ask Technology Branch to rule on it.
I can say that it's DIRECTLY BECAUSE of that, they have issued this new determination.
Those that wrote in afterwards... Stupid fuckers that didn't know how good they had it. You can't fix stupid, either.
Here's the whole thing, directly from Max Kingery, ACTING Chief.