That number, 7, was not arbitrary. They chose it because it was more than most revolvers hold, but fewer rounds than most semi-autos. They can now claim they aren't restricting sportsmen or target shooters because they were magnanimous enough to allow guns that carry more than wheel guns.....which aren't evil military style weapons.

Add to that that there are nearly zero seven round mags available for most handguns and rifles and you have a defacto to ban on hundreds of weapons not specifically addressed by the legislation.

Even the venerable M1 is now illegal by default in NY as it uses an 8 round enbloc, which I am sure that crowd would consider a "magazine."