I agree with you on the unconstitutionality of it. That aside it is long established since 1934 and the fines are steep for not complying with their unconstitutionality. That was more my point about class 3s weapons. It doesn’t matter how much we dislike it, the government will stick it in sidewaysThe law against class three of anything firearm related is against the Constitution!
"The the right to keep and bare ARMS shall not be infringed!"
Pop gun, machine gun, short barrel, long barrel, etc etc! They are all arms!