Browning M2 .50 cal machine gun..depleted uranium rounds
They don't jam very much and don't go through ammo like the GE M134 'Vulcan Cannon' pictured above which is an aircraft mounted gun I doubt anyone would be able to hold and fire it considering it weighs around 190lbs.



For perimeter control I would also be chucking these between bursts

And for music... strictly Slayer with maybe some Metallica/Megadeth sprinkled inbetween
Oh, if the zombie's did manage to breach the perimeter I would have 2 Navy Seal spec MP5's /w laser site's

Reason for the SEAL spec, it's much shorter then the standard SWAT issue MP5 thus allowing much more maneuverability ie. for run and gun tactics..