US v Miller
linked:
The signification attributed to the term Militia appears from the debates in the Convention, the history and legislation of Colonies and States, and the writings of approved commentators. These show plainly enough that the Militia comprised all males physically capable of acting in concert for the common defense. "A body of citizens enrolled for military discipline." And further, that ordinarily, when called for service these men were expected to appear bearing arms supplied by themselves and of the kind in common use at the time.
Show up with your own weapons, which shall be state of the art, not antiques.
By an Act passed April 4, 1786, the New York Legislature directed:
That every able-bodied Male Person, being [p181] a Citizen of this State, or of any of the United States, and residing in this State, (except such Persons as are hereinafter excepted) and who are of the Age of Sixteen, and under the Age of Forty-five Years, shall, by the Captain or commanding Officer of the Beat in which such Citizens shall reside, within four Months after the passing of this Act, be enrolled in the Company of such Beat. . . . That every Citizen so enrolled and notified shall, within three Months thereafter, provide himself, at his own Expense, with a good Musket or Firelock, a sufficient Bayonet and Belt, a Pouch with a Box therein to contain not less than Twenty-four Cartridges suited to the Bore of his Musket or Firelock, each Cartridge containing a proper Quantity of Powder and Ball, two spare Flints, a Blanket and Knapsack; . . .
It didn't say they should go get this stuff from a government armory. It said they should have this stuff themselves, and show up with it.
Fine. The USSC will rule that you may keep "a good Musket or Firelock" at home.
More than likely, the USSC would rule that the second amendment doesn't protect an individual right, and leave it up to each state to decide how they will organize their militia. A state could certainly allow individual possession of any weapon. That's always been true. We're simply talking about federal laws.