He was pointing out the stupidity of the 2nd Amendment gun nuts who think their AR15 will protect them from the big bad government.
He was saying how idiotic that is as a rationale for not limiting access to AR15s.
Good luck against F-16s, tanks, artillery, grenades, armored vehicles, and nukes with your itty bitty lady gun.
It might make you feel like a big boy with your AR15 because they are great for mowing down children in schools or people in malls...... but not so good for taking on a government controlled military.