The Watcher Disintegrator Gun is a short-range Watcher particle disrupter. Its projectiles are able to explode near enemies.
This weapon is very unique, as at close range it acts like a shotgun (in that it kills/disintegrates enemies in one hit), yet it is also like a grenade launcher (especially from long range) due to its projectiles' ability to explode on contact with enemies.
It is commonly found on Red Watcher Pawns.