Blundergat

The Blundergat is a new Wonder Weapon featured in the Call of Duty: Black Ops II zombies map Mob of the Dead. It is based on civil war-era weaponry, consisting of ideas from the both the and. Normally, it acts like a single-shot break action shotgun, but when upgraded, it becomes The Sweeper, with a 2 round magazine and 120 ammo in reserve. Suprisingly, the Blundergat has low recoil, despite its multiple cannon-like barrels.

When combined with the Acid Gat Kit, it becomes the AcidGat. It has an automatic 3-round magazine. When a zombie is shot while in its upgraded form, they will be stuck with an acid infused round which explodes soon after. When Pack-A-Punched, it becomes the Vitrolic Withering which makes the acid shots attract zombies similarly to the upgraded Crossbow and Gersh Device.

There are two ways of obtaining the gun, one being from the Mystery Box, and the other from finding five hidden skulls throughout the map. These can be obtained by throwing the Hell's Retriever at the skulls, and from that point proceeding to the Warden's Office where a Blundergat will spawn on his desk. This method allows two players to obtain the Blundergat at the same time.

Trivia

 * The Vitriolic Withering starts to make crawlers at around rounds 30-33.
 * This is the first Wonder Weapon introduced in Call of Duty: Black Ops II that can be Pack-a-Punched. Moreover, this is the first Wonder Weapon in the series that can be upgraded three times.
 * This is the second wonder weapon in Call of Duty: Black Ops II that does not need to be built, the first being the Ray Gun.
 * The Blundergat is, so far, the only weapon in Zombies that changes its model when upgraded without adding any attachments.
 * The Blundergat shoots 5 shells in a horizontal line. With double tap, this increases to 14, as long as it is a hipfire.