I don't. I'm perfectly content to leave it at "SCOTUS, in Miller, implied only militia-suitable arms are protected".
The poster to whom I was responding, however, equated Miller's short, sawed-off, double-barreled shotgun with the WWI Trench Gun. I thought that was disingenuous and needed addressing.
While I let out a big whoop of delight when I read that DC decided to appeal, when I came back down off the ceiling I got to thinking it is going to be a safe bet that the US Supreme Court will deny certiorari in this case.
It would fit the pattern of their recent decisions on Second Amendment cases.