Force Field
A force field weapon leverages the attacking starship’s shields as a deadly bludgeon. A force field weapon deals additional damage equal to its starship’s Shield Points (SP) in the weapon’s quadrant, with a maximum bonus damage value equal to the number listed with this special property. A turretmounted force field weapon uses the current SP of the quadrant from which it’s fired. A force field weapon cannot be fired from any quadrant that has 0 SP. Immediately upon firing a force field weapon—and before resolving any enemy attacks during the gunnery phase—the attacking starship loses a number of SP in that weapon’s quadrant equal to the number listed with this special property. Weapons with the force field special property are not compatible with deflector shields.
Source
Starship Operations Manual pg. 14