Personally I don’t believe the rule will reach the finish line as written due to pressure that ATF will face from members of Congress in the coming months, but I can say that if it does pass, challenges to the rule will not likely succeed. It doesn’t actually remove the right to have any firearm; it simply establishes rules under which certain firearms would be classified to a tax status; and it’s well established that the ATF can tax short barreled rifles. I hate it as much as any of us but the fact that we don’t like it doesn’t disallow it, legally.
My question is, among people who actually own a scorpion pistol, who plans to do form 1 anytime soon? I know I’ll be working through the form this week. It’s something I wanted to do anyhow, so I can install a stock, but this has accelerated the plan.