Primary weapons serve as the main armament on fighters and bombers.
Accuracy completely depends on the skill of the pilot, not on an Artificial Intelligence/Computerized Fire Control system of any sort. Size of the craft involved (and related power generation capacity) is the greatest determining factor for determining the number and type of primary weapons to be mounted.
Primary weapons vary from laser-based energy weapons such as the Subach HL-7 to ammunition-based cannons such as the Avenger. However, all primary weapons are unified in the fact that they are not expected to run out of ammunition during a mission. All primary weapons draw power from a ship's main reactor.
The SCP has implemented a way to use flak guns and beam weapons instead of standard lasers on fighters and bombers.