ATI® 8 - Shot Aluminum Mag Extension for 12 - Ga. Remington 870.
Expand your capacity with ATI®'s USA-made, precision-built Mag Extension! Made from military type III anodized aluminum so it's virtually indestructible. Installs easily, and features a ratchet base for a tight fit. Requires minimum barrel length of 20". Limited lifetime manufacturer's warranty.
12-Ga. Remington 870