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The Crye Precision SIX12 is a compact bullpup gas-seal double-action revolving shotgun developed by Crye Precision USA. The SIX12 is a modular weapon with interchangeable barrels for various applications, and can be configured as a full-length standalone weapon with a stock and handguard, fitted with a short barrel and rear pistol grip for use as a compact breaching weapon, or mounted to a rifle as a Masterkey-style accessory shotgun.
— In-game Description
The Masterkey shotgun is an underbarrel attachment featured in Battlefield 2042. It is available for various primary weapons, unlocked late in their progression. It functions as a six-round revolver shotgun, with one spare magazine carried.
After adding it to a weapon's customization (and equipping it if not the default underbarrel attachment), the player must press thebutton to switch to it.
- It is named after the similar Knight's Armament Company Masterkey, despite having a completely different design.