The ProMag Archangel AA113 7rd 12 Gauge shell carrier mounts to the side of the Mossberg 500/590 receiver, delivering convenient, on-the-fly ammunition access for shotgun operators who value quick reloading and streamlined setup. Constructed from durable polymer with an aluminum mounting plate, this black shell holder integrates a precise retention adjustment system that lets you fine-tune tension for each shell, ensuring reliable retention tailored to your chosen 12 gauge loads while reducing rattle and holdup under heavy use. A rubber molded gasket sits between the mount and receiver to protect the firearms finish during deployment and cycling, and the design ensures the shell carrier does not contact or interfere with the pump-action forend when used with military-length forends. Ideal for competition, fieldwork, or tactical scenarios, the Archangel 7-round carrier adds capacity without bulk, keeping your shot strings uninterrupted and your setup clean. With compatibility specifically calibrated for Mossberg 500/590 platforms, this ProMag solution provides a robust, purpose-built accessory that enhances reload speed and firearm ergonomics in a variety of 12-gauge applications.