See this from Brownells. The panic buying is good, I think, because it’s encouraging manufacturers to run flat out as fast as they can. If there’s a ban with grandfathering, it’ll be essentially meaningless because there will be too many of them out there. If there’s no grandfathering, there will be so many of them out there, it’ll be hard to argue they aren’t in “common use.” If the Court was serious about that test, none of what we’re threatened with should stand. But it could be years before we get to the Supremes, and who knows if the Court will change.