He used a .223 AR. That's not a pistol.
According to CNN, the .223 Bushmaster was found in the trunk of the car; the weapons found on him were the Glock and the Sig Sauer.
I live in a state where it's not super easy to obtain a firearm permit. Paperwork, background check, mental health record check
, etc. But you know what? I don't mind that. I appreciate the pita it is to obtain one. However, that is for people seeking to obtain a firearm legally.