Sustained Fire The player nominates the initial target and rolls to hit exactly as normal. If the player makes the to hit roll he can roll one or more special sustained fire dice to see how many actual hits are scored. The first of these hits will be scored on the initial target but any extra hits can be allocated to other visible targets within 4" of the first. Once all hits have been allocated roll to wound as normal.
The number of sustained fire dice a weapon can roll is indicated in its description in the Wargear book. A sustained fire weapon can always be fired using less dice than its maximum if desired.
Dreadnought Power Fist Against vehicles or other walkers, may make a special Tear attack. For every 2 hits scored, you may make 1 Tear attack. If you hit 3 times you could make 1 tear attack and 1 normal etc.
The Tear attack nominates a single location on the target. Roll penetration as normal. If succesfful, when rolling for damage add +2.
Dreadnought Sustained Fire For assault cannon or storm bolter, Ignore first jam result rolled each turn. An assault cannon will only jam if you roll 2 or more jams. Rolling 3 jams still causes the weapon to explode, destroying the arm.
For Heavy Bolter, first rol the number of total sustained fire dice you wish and then ignore the first jam from that. You cannot ignore the jam for each individual heavy bolter.