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QM: The generators each have 50 points of damage. To utterly destroy and shred them into scrap metal with the shotgun, you would need to run up and fire point blank rolling higher than 50 on 8d12. Alternatively you can just aim single shots at the generators (they auto hit during your surprise attack rounds, no roll for this) to conserve ammunition. This will make the generators unreliable - the roll will be 5/6 in your favour, but if they go off... it will be unpleasant.