Archangel Tactical Stock System for Mossberg 500/590® with Shell Carrier – An advanced Tactical Stock System for the Mossberg 500/590® 12 gauge shotgun utilizing a proprietary lightweight carbon-fiber reinforced polymer impervious to weather and able to withstand all standard gun solvents and oils. A six-position collapsible butt-stock allows shot-gunners of all sizes to find the optimum adjustment for fit and comfort.