I’ve followed it and the first paragraph is spot on. But I’d argue something doesn’t have to be a firearm to be protected, see Caetano v Massachusetts. It probably would also protect other items adjacent or necessary for the intended purposes of the amendment; like some types of ammo, parts, or accessories. If bumpstocks fall into that is another question though. Reading the tea leaves it doesn’t seem like it.

But, it instead enacted a statute that turns on whether a weapon can fire more than one shot “automatically . . . by a single function of the trigger.” §5845(b). And, “it is never our job to rewrite . . . statutory text under the banner of speculation about what Congress might have done.” -pg 19