Brace = SBR.
No, really, the whole point is to put a stock on a pistol. We can argue it to kingdom come, but the workaround was intended to skirt regulation and the ATF couldn't stop it. How many one armed shooters buy the brace compared to the number of able bodied?
I wouldn't worry about the ATF challenging the mod as much as some range safety employee or self appointed bystander who likes to work for them pro bono. It's deceiving in the same way an extra circular marking on the lower receiver resembles a full auto pin for the auto sear.
I agree we don't need these regs. The point is why do we need to make things that look "extra legal" at all ? Since they are as fake as a chinese Rolex it's the unlearned who think they might work. Appearance for appearances sake. The gun forum version of an aero body kit in a S10 truck. It doesn't make it adjustable, why bother?
Looks. Not function.
I shoot my pistol no brace bare buffer and I can see where the bullets hit the man size target at 25m. I don't get why so many think they need to do better, hits on a torso are exactly what it should do. I have no illusions I'm an Olympic level operator who can place hits and decide whether it's going to be a 9 ring versus 8 ring when they are shooting back at me.
Embellishing a gun to appear as if it needs an ATF stamp then leads to the next step = a fake ATF stamp. Why not? Looks cool bro.