Pretty sure it'd still be illegal and someone would eventually shoot you. ATF just shoots your dog before they shoot you because they can't tell the difference between a carbine pistol chambered in 5.56 with a wrist brace and a short barreled rifle.

I mean, they're almost functionally identical, but that's what happens when there's an arms race between gun makers skirting illegally by technicality and the atf trying to plug gaps. Either way though, dog shot.