Shotgun Tri-rail Mount / Mag Tube Mount (3 Slot) Shotgun Tri-Rail Barrel Mount Complete with Tactical Flashlight Clamping Feature Each Rail has 3 Slots lightweight and durable, this system positions three Picatinny rails at the front end of the shotgun so you can mount Tactical flashlights and laser sights. Made of aircraft grade aluminum with a matte black anodized finish. Lifetime Warranty.