The Faderator

 is a cut weapon in the Fallout: New Vegas expansions Dead Money, Honest Hearts, and Old World Blues.

Characteristics
The Faderator is a unique variant of the Gauss rifle, which in appearance is identical to the standard weapon. Its actual properties are much different, with a lower ammo usage per shot, larger ammo capacity, automatic operation, very high hit chance in VATS, tons of knockback, and in particular a dramatically increased rate of fire, bringing the weapon's calculated damage-per-second to 20,160.

It shoots a spread of 3 shots with one trigger pull almost like a shotgun. In V.A.T.S. it shoots 36 rounds but it shoots three at once so you see it shoots 12 times.

Based on these factors, as well as the weapon only appearing in one normally inaccessible test cell, it can be assumed that The Faderator was never meant for legitimate inclusion in the add-ons. Like the Debug 9mm and The Disintegrator laser rifle, it's likely that the Faderator was a weapon designed to help developers and playtesters get through combat as quickly as possible, possibly evidenced by the low skill and strength requirement for effective use.

In fact, this weapon has unlimited ammo. It will use your ammo if you have some (max charge, bulk, etc.), but your ammo will not go down. (You only need one cell of the ammo you want to use because of its breeder effect)

You never have to reload because it has the microfusion breeder effect but fast enough that you never have to reload no matter how long you shoot it. If you have the Fast Shot trait, firing this weapon full automatic may cause your game to run slowly until you stop firing it.

Locations
The Faderator cannot be found anywhere in the game, and can only be obtained through the use of console commands or use of game save modding tools.

It can be found in a room with the console command coc testmentats

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