The Snope v. Brown circuit court case isn't precedent here, so unless cert is granted it has no direct impact on Massachusetts. Ocean State Tactical is a different matter. Unless cert is granted and the case reversed, it'll make it extremely difficult to win a challenge against Massachusetts's ban on standard capacity magazines.
The worst that can happen is that the Supreme Court grants cert and upholds the Maryland ban. You can then expect states like Massachusetts to push the decision to the limit by banning any semi-automatic carbine, rifle, and rifle caliber handgun.
That the Supreme Court grants cert and decides that semi-automatic rifles and carbines are bearable arms, in common use, and reasonable weapons for self defense. They also decide that some or all of criteria used to define an "assault weapon," bears no rational relationship to a legitimate state interest. They also rule that limits on magazine capacity are not supported by "historical tradition." As a long shot, they also overrule Miller.
Massachusetts residents can then purchase, possess, and carry the same firearms as in less knee-jerk "we must do something" states.
