It's pretty obvious that O'Reilly surrounds himself with toads and "Yes men". If he didn't someone would have pointed out to him what constitutes an fully automatic vs a semi-automatic weapon. They also would have explained that you can't buy machine guns without a special permit.
O'Reilly is just a big guy who's used to being able to bully people with his size. Next time he pokes a guest with his finger I hope the guest breaks that finger.