I personally can't watch his show, but have seen many clips of him interrogating his guests to count any self defense instances with an assault rifle. Here's one that's been linked here before that happened just this week.
No Shots Fired: Home Intruders Decide Not to Stick Around After Seeing Their ?Victim? Holding an AR-15 | Video | TheBlaze.com
There must be other sources of similar stories to stick in his pipe.