That's an interesting question - I wouldn't trust local law to not bust you with an evil mag or gun. I don't know if the Fed. law overrides state guns on type of gun.
It does. The question is whether or not NY LEOs choose to play by the rules.
Originally Posted by FOPA
18 USC §926A:
§ 926A. Interstate transportation of firearms
Notwithstanding any other provision of any law or any rule or regulation of a State or any political subdivision thereof, any person who is not otherwise prohibited by this chapter from transporting, shipping, or receiving a firearm shall be entitled to transport a firearm for any lawful purpose if, during such transportation the firearm is unloaded, and neither the firearm nor any ammunition being transported is readily accessible or is directly accessible from the passenger compartment of such transporting vehicle:
Provided, That in the case of a vehicle without a compartment separate from the driver’s compartment the firearm or ammunition shall be contained in a locked container other than the glove compartment or console.
"Notwithstanding any other provision of any law or any rule or regulation of a State or any political subdivision thereof ..." seems pretty clear to me.