Gun Control & RKBA

At some point, there will be smart bullets, rail guns, plastic guns, energy weapons, drone guns, etc., etc....so the OP is correct that it's worthless to continually argue about the design of "arms".

OTOH, the problem of too many firearm deaths is NOT due to the evolution of different arms. The problem is ACCESS. Some people should not have possession or use of any firearm, much less the more destructive ones.

It doesn't matter if you have an AR15 or another type of weapon, IF you are emotionally stable, you are trained, you have proper security/storage, and appropriate need for the gun. What matters is that unstable people, children, untrained people, criminals, and even known terrorists have EASY ACCESS to possession of firearms in the US.

A license to buy, possess, or use firearms would prevent some deaths and make it much more difficult for the misuse of any type of firearm. The license could easily require different training and security for different types of firearms. As new designs are available, the license is modified.

I'm posting this to point out that the logic of the OP does not address the issue of too many firearm deaths in the US.