I'm not sure they fire bullets at all actually. It looks like they're giving off some kind of electrical pulse. It's clearer on the bishop than on the rook.
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No no, you need a turret like this.
http://vignette3.wikia.nocookie.net/...20091219105735
Increase their weapon damage to match melee WD and problem fixed.
This is sad it's 2.0 all over again