Weapons with [SUSTAINED HITS X] in their profile are known as Sustained Hits weapons. Each time an attack is made with such a weapon, if a Critical Hit is rolled, that attack scores a number of additional hits on the target as denoted by ‘x’
Once per battle, at the start of the Fight phase, this unit can use this ability. If it does, until the end of the turn, weapons equipped by models in this unit have the [SUSTAINED HITS 1] ability.