We, for the most as civvie CCW'ers tend to romanticize the hand gun as the ultimate tool of the warrior against evil, how some ever, that is because we would get a lot of funny looks if we were to go walking about with an M-4A1 carbine.
I would stick to making the protagonist's primary being as authentic as possible and also his most used weapon.
NRA Life Member
Ladyfriend: "I need help with the leaves in the yard"
Me: "Controlled burn?"
LadyFriend: "I forgot my Boy Scout turned into an infantry officer."