I can store a ton of firearms in my garage but they can’t destroy the neighborhood by accident. High-explosives can.

People that buy high-explosives at scale just have some land outside of town where they can store them en masse. Problem solved. There are huge magazines of high-explosive just outside many major cities all over the US. Very infrequently, one of them goes “boom”, which kind of justifies forcing them to be on the outskirts.

You can own it, you just have to store it where it won’t wreck your neighbors if you are an idiot. Rural land is cheap.

Black powder, which is used (and at the time necessary) in the kind of firearms used when the 2A was conceived, has such limitations in any non-trivial (more than personal use) quantity.