For consistency, if nothing else, it doesn't make sense for the 2nd not to be an individual right and the others to be individual rights. The 2nd is in an interesting place, though, because of the restrictions on NFA items - the Supreme Court really reallyreally doesn't want to invalidate any of those restrictions.
(For non-US readers, NFA items are things like suppressors, short-barreled rifles and shotguns, and any firearm that fires more than one round for each time the trigger is activated. They're not illegal, but one can't own them without a $200 tax stamp, and anything that counts as "a machine gun" has to be registered, and the registry cannot have anything new added to it.)
no subject
(For non-US readers, NFA items are things like suppressors, short-barreled rifles and shotguns, and any firearm that fires more than one round for each time the trigger is activated. They're not illegal, but one can't own them without a $200 tax stamp, and anything that counts as "a machine gun" has to be registered, and the registry cannot have anything new added to it.)