explosives is a good idea because it clears out the hordes, and personally...i dont think they really have to worry about civilians anymore because its already at that late stage on the outbreak...no ones really out anywhere because they are either dead or hiding in safety...
I would love to see him firing a bolt-action rifle like Remington for a sniper rifle.
A pistol : I would say Desert Eagle with 0.50cal bullets.
a shotgun : the bump-action used by Takashi is good enough.
An assault rifle : M4 with M203 , The Ak-47 is also a nice one.
LMG : The SAW 'M249' is gonna kickass .