What's interesting about this is that when the constitution was written, the distinction between "civilian arms" and "military weapons" was comparatively tiny. Civilians didn't stroll around with cannons, largely like how civilians generally don't stroll around with RPGs or AA guns today. An important component of the intention of the 2nd amendment was that civilian population could defend itself from its own government oppression if necessary. With a large disparity between civilian and military hardware capability, that's not realistic.
I don't think it was reasonable to anticipate modern military hardware or even ww2 stuff in the 18th century, nor do I actually want to see people strolling around with rockets outside of video games. A lot of the regulation is pretty farcical though; as if having a few less rounds in a magazine or altering the grip will actually change the reality of what happens when person A opts to shoot person B, regardless of whether the choice is sound. Perhaps it's not as flagrantly idiotic as some of the knife laws in various countries, but it's still strange and reeks of "regulation to look like we're doing something".