NY has made criminals out of innocent gun owners. The ex post facto gun law, is a measure that criminalizes someone for something that was legal when they did it. are prohibited by the U.S. Constitution, under Article 1, Sect. 9 and Article 1, Sect.10, the latter section of which applies specifically to states.
Good. If he wants to be the renegade defying the constitution and rule of law, that's on him. Hopefully he'll wise up before he gets a bunch of public servants killed.