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. Works great wil all shotguns that have space to mount on mag tube & with shotgun magazine extensions. Fits Mossberg 500 Shotgun, Mossberg 590 Shotgun. Remington 870 Magnum Shotgun Winchester 1200 Defender, Winchester 1300 Defender, Ithaca Shotgun Model 37 Defense Mavrick 88, ect. Lifetime Warranty.