Blessed Ammunition

Source: Codex: Witch Hunters, p. 23

WITCH HUNTERS VEHICLE UPGRADES

Just as with choosing wargear for your Witch Hunter characters and units, the upgrades you choose for your vehicle should be represented on the model itself. Note that when choosing upgrades, no vehicle can have the same upgrade more than once.

Blessed ammunition

Any storm bolter or heavy bolter shots fired by the vehicle ignore cover saves.