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A sword won't run out of fuel, it will not jam, it doesn't need a magazine, it can attack from a distance and doesn't need much energy to use effectively. It can also slice through multiple zombies in one swoop.
It is also boss as ****.
I would use a triangular Flapjack
http://forums.overclockers.co.uk/showthread.php?t=18499628&highlight=flapjack
multiple crowbars