Source Starship Operations Manual pg. 16
A weapon with this property launches a massive adamantine-alloy spike designed to effortlessly pierce a starship’s hull. For every 5 by which the gunnery check exceeds the target’s AC, the rail weapon’s damage increases by the amount listed with this special property. Rail weapons require exceptional amounts of energy to operate, and their ammunition lacks any homing capabilities. As a result, a rail weapon can be fired only with the shoot and precise targeting gunner actions, and the attack does not benefit from any science officer actions.
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