And this will be important later.
From the Heller decision:
Miller’s holding that the sorts of weapons protected are those “in common use at the time” finds support in the historical tradition of prohibiting the carrying of dangerous and unusual weapons.
I’m not a lawyer so take this for what it’s worth. The definition of dangerous and unusual weapons, and the carrying of, may come up if certain gun control laws are passed. “Dangerous” is not very useful or descriptive. Is gun, is not safe. So, meh. However, on to unusual. What is unusual? I doubt that the most popular rifle in America is unusual. And I doubt most common handguns are unusual.
So, what exactly is? I suppose that, since the 1986 assault rifle ban (yeah, they’re already banned) a machine gun would be unusual. What else?