Again I don't understand how you think you are going to limit anything.  Anders Breivik's attack was far worse and he didn't use a bump stock or full auto.  He had a Ruger Mini-14 which is widely known as a basic sporting rifle.

Why does the most well equipped and technologically advanced military in the history of all mankind have issues with a non-professional military in the middle east?  The entire history of Mongolia is littered with small bands of people antagonizing larger forces.  If deterrence works at the nation-state level it will surely work at the individual level.  My right to defense shall not be infringed.