You're forgetting that the whole point of the right to bear arms being that you are able to protect yourself from hostile individual threatening your life.
These hostile individuals use modern weapons and the point of the article is to even the playing field between criminals and peaceful citizens.
War has evolved with technology and if you want to maintain a level of protection you need to adopt the new technology as it evolves.
"Anarchism is not a romantic fable but the hardheaded realization, based on five thousand years of experience, that we cannot entrust the management of our lives to kings, priests, politicians, generals, and county commissioners."