In contrast with the L30 Gatling laser, this model is not only fully automatic and has a much larger ammo capacity, requiring a back-mounted battery pack, but was also mass produced for military use. While they entered service shortly before the war, they quickly became an important part of the arsenal, both of pre-War and post-War factions.
The main advantage of the precision Gatling laser is its high critical chance multiplier. Its effectiveness is dependent on the character's base critical chance and whether the Better Criticals perk is chosen. It is also repairable with regular Gatling lasers.
This Gatling laser can only be found during Who Dares Wins, the final quest in Broken Steel's main plot line, where you must assault the Enclave-controlled Adams Air Force Base. When you get into the mobile platform search for the armory (not the one on the level you first enter), there are two entrances: One leads through the mainframe and the other through the main deck where the deathclaws are confined. Near the entrance from the main deck you'll see an Enclave soldier, the armory master, wearing Tesla armor and a unique recon helmet called the composite recon helmet. The armory master will be carrying the precision Gatling laser.