ShermanJumbo-Masterkey icon

Masterkey

An attachable pump-action shotgun for AR-15-pattern rifles with an M203 mount. Also includes M203-to-Picatinny and Picatinny-to-M203 adapters!

Available versions

Please note that the install buttons only work if you have compatible client software installed, such as the Thunderstore Mod Manager. Otherwise use the zip download links instead.

Upload date Version number Downloads Actions
2025-4-14 1.1.0 1707 Download Install
2025-4-6 1.0.0 644 Download Install