Here's another way to go:
It's a Mag-Tech "non-gun"; upper action for a 1911 frame. Not exactly something that I'd stake my life on, but it's a hoot to shoot and it was not expensive (~$250). Here's some results at 50 yds:
It makes a strange "twanging" resonant sound from the stock when fired. However, for the more serious, zombie applications, I too would stick with the M1 carbine:


It's a Mag-Tech "non-gun"; upper action for a 1911 frame. Not exactly something that I'd stake my life on, but it's a hoot to shoot and it was not expensive (~$250). Here's some results at 50 yds:

It makes a strange "twanging" resonant sound from the stock when fired. However, for the more serious, zombie applications, I too would stick with the M1 carbine:
