Supreme Court here we come, between FOPA and:
Full Faith and Credit shall be given in each State to the public Acts, Records, and judicial Proceedings of every other State. And the Congress may by general Laws prescribe the Manner in which such Acts, Records and Proceedings shall be proved, and the Effect thereof.
Booperburger and his sting operations in various states may come to a screeching halt as the bright light of a very unfavorable spotlight is shined on the unsavory 2nd amendment policies of his lovely city. That doesn't even count MAIG and its rogues gallery of mayors convicted of every crime from drunk driving to fraud to racketeering to tax evasion to sexual misconduct. They all have one thing in common, they don't like guns in the hands of citizens.
Good intentions will always be pleaded for any assumption of power. The Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern will, but they mean to govern. They promise to be good masters, but they mean to be masters.