Assault Weapons with [ASSAULT] in their profile are known as Assault weapons. If a unit that Advanced this turn contains any models equipped with Assault weapons, it is still eligible to shoot in this turn’s Shooting phase. When such a unit is selected to shoot, you can only resolve attacks using Assault weapons its models are equipped with.
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’.