Precision Weapons with [PRECISION] in their profile are known as Precision weapons. Each time an attack made with such a weapon successfully wounds an Attached unit, if a Character model in that unit is visible to the attacking model, the attacking model’s player can choose to have that attack allocated to that Character model instead of following the normal attack sequence.
Rapid Fire Weapons with [RAPID FIRE X] in their profile are known as Rapid Fire weapons. Each time such a weapon targets a unit within half that weapon’s range, the Attacks characteristic of that weapon is increased by the amount denoted by ‘x’.