I dont pay too much attention to the laws around AR pistols, but didn't the ATF come out and say it is illegal to shoulder a Sig or Shockwave brace? If so, what is the point of the brace now? I've never seen anyone actually strap one to their arm as we all know it was just a loophole to build something close to a SBR. So I guess I fail to see the point of the brace now.
Yes they said if you use a brace for an unintended purpose i.e. shouldering then it is in fact against the law and you are in possession of an SBR without tax stamp.