Bored of the choice of weapons available in Call of Duty: Advanced Warfare? Here’s an RPG gun that looks like it wasn’t meant to be in the game, but can be found by going off path and into a building in the level called Throttle. The weapon is usable, and the video above shows you how to get to it (note: skip to 0:23 to prevent your ears from hurting).
User AH Community believes it’s an Easter Egg, but as other users point out, it’s probably a hold-over from the previous games. You can still use it, though, so it doesn’t matter. Enjoy!