Note to game developers: It's probably best to clean up all your assets before a game ships, lest gamers with absolutely nothing else to do find some creative way to stumble across your secrets—or misplaced items.

In this case, the latest bit of digital adventuring comes from the latest Call of Duty: Advanced Warfare title. In it, you have to head on over to the game's thirteenth mission—Throttle—and go pretty far off the beaten path by jumping your way to the very top of one of the map's buildings. On top, you'll find a rather odd looking gun floating in the air. It's named "WEAPON_RPG"—an item the game's developers likely meant to delete at some point and never did.

You can, however, equip the oddly named weapon. Oddly named, and oddly fitted to Call of Duty: Advanced Warfare's general environment, as it's a fairly older device among the game's lasers, plasma rifles, and other futuristic weaponry. As an added clue that the game's developers likely didn't intend to keep it in, the rockets themselves don't do much damage when you fire them at things. And the gun itself doesn't actually make any noise when you fire it.

If you'd like a step-by-step tutorial for checking out the hidden gun yourself, be sure to check out the video from Achievement Hunter below.