Just to be clear, no SCOTUS case has yet stated that citizens are entitled to own fully automatic firearms, and it seems to me exceedingly unlikely that they would. Heller talks about how to decide what kinds of firearms can be prohibited, and strongly indicates that you can't ban 9mm handguns because they are the most popular firearm for self-defense and so on. It's hard to see how one can extend Heller and this case to say that you cannot prohibit fully automatic firearms.