I would have to check things closer but the one thing i know where the difference is NY and CA have different rules on a fixed mag. In CA a fixed mag can be removed by breaking the gun open and removing a screw or something quick and easy like that. In NY the ones they have have a different mag release button with a tiny screw on each side of the center hole that are screwed in that don't allow the mag release button to be pushed and to make in NY legal where it's permanent the screws are epoxied over. NY has the word permanent used in several places concerning the gun mods even though nothing is technically permanent. and example would be that threaded barrels on semi's with removable mags are illegal so you could cut the threads off(if the barrel is long enough) or weld a thread protector on which is considered permanent. New threads could be cut at any time or the welds ground off and thread protector removed so it's technically not "permanent".