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Mob of the Dead BO3 Custom:
Blundergat

The Blundergat of Mob of the Dead BO3 Custom: the five skulls of the free Blundergat, the parts of the Acid Gat Kit, and the new Magmagat step by step, from the fireplace of the warden's office to the forge of the power room.

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3 capitoli
aggiornato 2026-11-14

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The Blundergat

The Blundergat, the blunderbuss wonder weapon of the Black Ops II original, comes back in Mob of the Dead BO3 Custom with its model and animations taken from Black Ops 4. It still comes out of the Mystery Box, and it can be earned for free. The remaster gives it two elemental forms: the Acidgat of the original, and the Magmagat, new to this version.

The free Blundergat: with the Hell’s Retriever, hit five blue skulls hidden around the map, in any order. Three guides agree on the five spots:

In the cell block next to the library, in the lit cell outside spawn, on the toilet.
On the roof, at the far left corner, on the edge of the next building.
At the docks, on one of the wooden posts in the water.
On top of the light pole outside the map near Juggernog, the one closest to the bottom of the gondola: charge the throw and jump.
On the telephone pole outside the back window of the warden’s office, in the Speed Cola room.

The desk of the warden’s office

With the fifth skull, the desk bursts into flames and a Blundergat appears on it.

The Acidgat

The Acid Gat Kit is built the same way as in Black Ops II. Its three parts each have three possible places:

Part	Where it can be
Case	Under the stairs of the main cell block; opposite the Afterlife panel by the entrance to the showers; past the C-D Street door from spawn
Motor	In the warden’s office: in the left corner of the Speed Cola room, to the left of the Mystery Box spot, or to the left of the Uzi wall weapon
Sample	In the infirmary: in a corner of the room full of baths, on the table left of the lone blood-filled bath, or on a trolley in the hallway

The kit is built at one of the three workbenches (past Electric Cherry upstairs in the cell block, at the entrance to the docks, or in the cafeteria). A Blundergat put inside comes out as the Acidgat after a moment; its acid shots attract the zombies, Kunjora notes. Pack-a-Punched it becomes Vitriolic Withering, and an upgraded Blundergat comes out already upgraded.

The green acid sample of the Acid Gat Kit on the tiled floor of the infirmary, Mob of the Dead BO3 Custom, Call of Duty Black Ops III Zombies

The sample

The acid vial, here on the floor of the infirmary, picked up like every part with a prompt.

A workbench with its blueprints and the prompt Hold to craft the Acid Gat Kit, Mob of the Dead BO3 Custom, Call of Duty Black Ops III Zombies

The workbench

The bench offers to craft the Acid Gat Kit once the three parts are carried.

Vitriolic Withering

The upgraded Acidgat, here in the showers, where its kills also feed the Golden Spork quest.

The Magmagat

The Magmagat is the novelty of the remaster. It borrows the tempering step of Blood of the Dead, the Black Ops 4 map set on Alcatraz, and Hybs, one of the mappers of the remaster, shows it in a short video guide. Kunjora, Watchful Wolf and Hybs give the same steps:

Have a Blundergat or an Acidgat, and fly to the bridge and back: three times in all for the video guides (see below).
In the Speed Cola room of the warden’s office, interact with the boards over the fireplace until they burn away, then put the weapon in the fire.
The office locks down: kill zombies nearby until the three skulls above the fireplace glow blue, then take the Tempered Blundergat.
Carry it down through the Citadel tunnels to the power room by the docks before it cools down. Blue-flamed barrels along the way stoke it again: walk up to each one. The Steam guide warns that switching weapons or using a GobbleGum loses the temper.
Power the forge on the left side of the power room, then put the weapon in: it comes out as the Magmagat.

The burning fireplace of the warden's office during the lockdown, skulls on its mantel, Mob of the Dead BO3 Custom, Call of Duty Black Ops III Zombies

The fireplace

In the Speed Cola room. The lockdown fills the three skulls on its mantel.

A barrel burning with a blue flame against a brick wall of the tunnels, Mob of the Dead BO3 Custom, Call of Duty Black Ops III Zombies

The blue barrels

Their flames keep the Tempered Blundergat hot on the way down.

The forge

In the power room: once powered, it gives back the weapon as the Magmagat.

Kunjora adds that the Acid Gat Kit and the forge swap the two forms freely once both are built, and that the Magmagat can be Pack-a-Punched like the others. The video guides, recorded around the release, ask for three trips to the bridge. The change notes of November 30, 2024 (version 1.0.1) removed the “requirement to ride the plane 3 times” for a questline whose name they hide, and the Steam guide, written later, says one trip is enough for the Magmagat; no source says outright that the hidden questline is this one. The Workshop change notes of December 5, 2024 removed a time limit on the tempered step that softlocked some players, and tried to fix a Magmagat crash in high rounds.

Stamin-Up, the room the Magmagat opens