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Masterkey IRL

An SIX12 underbarrel shotgun in real life.

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.[1]

Battlefield 2042[]

"Shotgun mounted to rail system."

— 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 the Toggle underbarrel button to switch to it.