You have to supply your own. For me, I'll take an AA-12.(the one they used in Predators) with about a million rounds.
I would prefer a minigun, but for maximum carnage and diabolical laughing i'm with you, AA-12 all the way!
ehh think cheap think reliable, grab a baseball bat, guns should be a secondary option.
In the zombie apocalypse a gun should always be your number one item