Sunder Attacks with this special rule may re-roll failed Armour Penetration rolls against Vehicles and Buildings (both with Shooting Attacks and in close combat) and re-roll Glancing Hits, in an attempt to instead get a Penetrating Hit, but the second result must be kept.
Specialist Weapon A model fighting with this weapon does not receive +1 Attack for fighting with two weapons unless it is armed with two or more Melee weapons with the Specialist Weapon rule. The additional weapon does not have to be the same weapon as the one used to attack, but it must have the Specialist Weapon rule in order to grant an additional Attack for fighting with two weapons.