Heavy Weapons with [HEAVY] in their profile are known as Heavy weapons. Each time an attack is made with such a weapon, if the attacking model’s unit Remained Stationary this turn, add 1 to that attack’s Hit roll.
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’.