Geez Louise. We lived in Newton, Massachusetts, for 7 years with not one, but two, "military style assault rifles" and becoup "high-capacity magazines". Several shotguns and .22s were also in our possession. And...
...no one ever got hurt.
Yes, I had my FID (Firearms Identification Card) and all the weapons were registered per Massachusetts Law. But even without all that, no one would have been hurt by our weapons - unless they tried to hurt one of us. You stood more of a chance of being injured by a Green Line T than by me with my green Steyr AUG.
Hattip: The Shoulder Thing That Goes Up via Gun Pundit.