Sig MCX Patriot
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The XTR12 Patriot mag lock by Bullet-Button works similarly to other patriot locks on the market. The "removable" adjustment screw is permanently fixed and shaved to ensure a smooth action for magazine removable when the action of the firearm is open. The installation hole on the device is filled with a black resin to comply with permanence. Stock is pinned or disabled due to separate shotgun AW regulations.