At which point they are acting as an agent of the state, under state powers, and thus it's not a "right".
There's a federal law against non-Militia members owning such weapons.
So name a single militia member who owns an M4 (or any other post-'86 machinegun) in their own name.
I just got finished telling you "when that person is acting as a member of the state Militia". Not on their own.
Is there something wrong with you? Seriously.