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
Big Sister: "You should be sponsored by Allen"
Me: "If you can't shoot good, at least look good walking to the firing line."
Big Sister: "Can you not afford a Pelican? Then buy an Allen gun bag."