This is the frustrating/annoying part. There's a HUGE difference between a machine gun and a AR/AK platform rifle. People who really don't even know what they're talking about jump into the discussion against certain types of firearms because they look scary.
This is an AR-15:
This is my Marlin 336:
Wanna guess which one will do more damage? Hint: It's not the evil-scary-looking-pseudo-military one.