- For the attachment in previous games, see Shotgun (attachment).
- "This gun has an under barrel shotgun."
- — Description
The Master Key is a Gun Perk featured in Call of Duty: Infinite Warfare.
Campaign
The singleplayer version of the Erad submachine gun is equipped with a Master Key by default.
Multiplayer
In multiplayer, the Master Key is only available to the Epic Cerberus variant of the Erad.
Zombies
In Zombies, the Masterkey is available to the Cerberus variant of the Erad, just like in multiplayer.