It is obtained from Biwwy in Little Lamplight for five hundred caps (250 with Barter skill) or free with the Child at Heart perk.

Wazer Wifle - This unique variant of the AER9 has lower damage than the tri-beam, but higher durability and a larger magazine.

Laser rifle - Standard version found throughout the wasteland.

Variations of the AER9 exist in Fallout 3 and its add-ons: The tri-beam laser rifle can fire a total of about 333 shots, the equivalent of 42 reloads, from full condition before breaking.

Unlike other energy weapons, tri-beam laser rifles do not ignite trapped gas. Therefore, even one with a high level can be devastated by an opponent wielding this weapon within 4-5 hits. The + 40 damage is for each beam, thereby increasing its damage potential to 120 per shot, and this value is not mitigated by the player character's damage resistance, nor the condition of the gun itself.

This weapon has an object effect that allows it to do 40 additional points of damage when targeted against the player character. Since each pull of the trigger consumes three microfusion cells, it has an effective magazine size of eight shots. The tri-beam laser rifle fires three laser beams with each shot and expends three rounds per shot.

Fallout new vegas tri beam laser rifle