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Side arm wise, well that's a toughie. It's nice having a magazine for fast reloads, but reloading magazines is in and of itself time consuming. Probably would have to go with a .357 revolver. You aren't going to pull this out until it's a last ditch effort, and a .357 to the face should take the fight out of any zombie. Even baring speed loaders, I can pop in 6 rounds quicker than I can thumb in several into an semi mag.
Don't like to use a firearm for zombies(just not as fun), but do carry the FN for back up.
BFG from Doom 3 + Kukri
in reality, AK47 + Kukri.