[Emphasis mine]
See United States v. Miller, 307 U.S. 174, 178 (1939) (the Second Amendment guarantees no right to keep and bear a firearm that does not have "some reasonable relationship to [445 U.S. 55, 66] the preservation or efficiency of a well regulated militia")
The implication is clear, the right to a firearm is directly tied to, and requires that the firearm in question has some reasonable relationship to the militia. If it's just a plain old gun to go shoot some cans with, it is not a constitutionally protected right of ownership.
And I've not done any research, perhaps you have, how many of the privately owned guns in your state (or mine for that matter) have anything at all to do with your/my State National Guard?