Correction: the _Miller_ case did not address full-auto. The court found inadequate support for whether sawed-offs were suitable for military service (didn’t say they weren’t, just that there wasn’t enough legally objective proof they were) and sent the case back to lower court to gather that info and review in light thereof. As Mr. Miller hadn’t even shown up for the SCOTUS hearing (and was deceased soon thereafter), the matter was dropped ... and the mess it made from being dropped translated into the institutionalized mess we have now, with no judges (SCOTUS included) wanting to come anywhere near it for cleanup.
That was the one. Yes, I know it had nothing to do with FA but nonetheless, FA is still banned. I recall Miller’s attorney was ready to go but his client disappeared. The government made the argument sawed-offs were not suitable, again from my recollection. That was point that the government made that argument and it was inconsistent with the ban on FA weapons. Of course the constitution contains no such nonsense giving government any power to determine the suitability of any weapon, FA, sawed-off or pitch fork!