The tri-beam laser rifle has the appearance of a "sawed-off" laser rifle, missing the tube on the bottom length of the barrel, being rather shorter than other models, and having a new emitter aperture and attached wires. The new emitter fires three laser beams with each shot. While uncommon in the wasteland, it can be readily found with the New VegasBrotherhood of Steel. It uses 3 microfusion cells when fired. This weapon degrades very quickly and is very expensive to repair. With the Jury Rigging perk it can be repaired by normal laser rifles. The weapon is unable to be modded unless it is the GRA version, in which case several mods are available.
Due to the fact that it fires 3 beams at once, it can score a critical hit for each beam outside of V.A.T.S. This effect allows it to sometimes, (with a critical hit for each beam) hit a huge amount of damage (132) per shot. Depending on your perks and Luck, this weapon can be a good choice just for its 3 beam shot.
The tri-beam laser rifle boasts a greater damage per second and critical hit multiplier when compared to its plasma equivalent, the multiplas rifle. However, the tri-beam laser rifle is heavier, and much more expensive to repair.
As with the multiplas, use of over charge or max charge microfusion cells allows the weapon to overcome its flaws against most armored targets, but the increased degradation effect is also applied for each shot.