Rapid Fire is a powerful tool, both for player characters and enemies. It’s recommended that enemy characters only use the Rapid Fire Trait for their weapons once per combat. Alternatively, each time an enemy Rapid Fires, they should spend their following action reloading their weapon. This removes the burden of ammunition tracking from the GM, and reduces the chance that player characters are obliterated in a hail of gunfire. This can be explained by enemies having limited ammunition, or poor weapon discipline compared to player characters.
When you fire this weapon, you can declare that you are Rapid Firing. If you do so, you may either choose to grant the weapon the Spread Trait, or you may gain Advantage on the attack roll and increase the weapon’s damage by its Rapid Fire rating.
In either case, reduce the weapon’s magazine by its Rapid Fire rating. You cannot Rapid Fire if your magazine currently contains less ammunition than its Rapid Fire rating.
Weapons with Rapid Fire are always treated as having the Burst trait, though you cannot combine these two features.