ATI Mossberg Halo Side Saddle and Six Piece Add-a-Shell Package Halo side saddle Military Type III anodized, 6061 T6 aluminum Mounts using existing screw holes in the top of the receiver Sleek skeletonized side saddle design Weighs Only 5 1/2 oz Halo Side Saddle Mounts Using Existing Screw Holes in the Top of the Receiver Six Modular Add-a-Shell Shotgun Shell Holders