Remington 7 Shot Aluminum Mag ExtensionExpand your round capacity to 7 shots with ATI"s Aluminum Mag Extensions for Remington 870 Shotgun.- Holds an Additional 2 - 2 3/4 Shells- Constructed of Military Type III Anodized, 6061 T6 Aluminum- Virtually Indestructible- Minimum Barrel Length of 18.5 for 7 Shot Extension- New Spring- Easy Installation- Ratchet Base for Tight Fit- Banding around base to distinguish between Winchester (3 Bands) and Remington (2 Bands) Mag Extensions- Manufactured in the USA- Limited Lifetime WarrantyFor: 12 GA Remington 870