Hasmith99

That's a really, really good idea, but it looks like something something created by the devil himself, not by man. A gun like that should side-quest and a back-story. Possibly with a certain perception/repair skill you can examine the gun and create a blueprint, giving you the option to create a man-made variant at workbenches to give to your companions.

A combination of a blunderbuss and a gatling gun, this new weapon acts like a single-shot break action shotgun, with multiple cannon-like barrels and low recoil, because of its original appearance in the Call of Duty: Black Ops II zombies map "Mob of The Dead". More details here: http://callofduty.wikia.com/wiki/Blundergat