Firearms are rare in the dome, but not unheard of. Some settlements have a working machine gun or cannon as the centerpiece of their defenses, and the occasional pistol or rifle finds its way into the hands of mercenaries and adventurers.

Energy weapons exist in the dome, though they are even rarer than ballistic firearms.

For the most part, firearms will function as per the rules laid out in Ultimate Combat and the Technology Guide. Ballistic firearms resolve as touch attacks within the first range increment (except against technological armors), lasers don't work against invisible enemies, etc. Damage for these weapons will be increased from the rather lackluster damage of the Pathfinder options.