三眼激光枪就像是把普通的AER9雷射步枪给砍了一半，然后在枪的前边装了一个分光的格栅。在枪体的中部额外追加了一个似乎是激光瞄准的部件。It also has a black-green, darker tone than the standard laser rifle. 每扣动一次扳机都会射出三道激光，等同于三倍的能量電池消耗速度，也就是只能发射八枪。
Laser rifle - Standard version found throughout the wasteland.
Wazer Wifle - This unique variant of the AER9 has lower damage than the tri-beam, but higher durability and a larger magazine. It is obtained from Biwwy in Little Lamplight for five hundred caps (250 with Barter skill) or free with the Child at Heart perk.
Metal BlasterThe Pitt (add-on)- This unique variant of the AER9 fires nine beams at once, using one microfusion cell similar to the Protectron's Gaze laser pistol. This feature, coupled with its remarkably high damage-per-shot, makes it a devastating short to close-range weapon, though its effectiveness greatly diminishes at a range with the "shotgun effect". It can be obtained by bringing fifty steel ingots to Everett in The Pitt.
Operation: Anchorage add-on includes an unused add-on-specific version of the laser rifle. It is identical to the normal laser rifle in both statistics and appearance. Its intended purpose in the add-on is unknown and it was cut from the final release, rendering it accessible only through the use of console commands.
A "demo" version of the laser rifle is included in Fallout 3, presumably left from the game's E3 demo. It does one point less damage per shot and less than half the critical damage than the standard variant, but has a much higher critical chance percentage. It is not used anywhere in the game and is only accessible through the use of console commands.