It uses the same designator sight system and battery pack and identical laser beam as the PA-21, but an advanced focusing chip for increased refire rate — the PA-31 can be fired approximately 5 times for every 3 shots from a PA-21. Its intense and rapid-pulse varicolor laser beam is particularly effective against robots and ambulatory weapons platforms. Despite its power, it leaves intact (and lootable) enemy bodies.
Known as a "lightning rod", it is the standard arm of the Special Forces "lightning teams" during anti-armor missions, attacks on armored emplacements, and special missions.. Outside these, at least one trooper in every infantry squad carries this weapon. Soldiers and Storm Troopers carry this weapon. As of 3 May 2194, all users must be trained and registered by the WEC in order to use a PA-31.