The Riot AEW is a fake weapon based in LAER on Fallout: New Vegas. This weapons has been used by Las Vegas SWAT team before the bombs for arrest high armored criminals, it's literally a "Laser shotgun". AEW is for Advanced Energy Weapon.
The Riot AEW has the appearance of a "sawed-off" LAER, the emitter fires six laser beams with each shot. It uses 2 microfusion cells when fired. This weapon degrades very quickly. With the Jury Rigging perk it can be repaired by normal laser weapons.
The Riot AEW degrades rapidly, as it can only fire a total of about 495 times using standard cells, the equivalent of 42 reloads, from full condition before breaking.
Behind the scenes
It's a fake weapon ! :D