This Patented Tri-rail ligh mount for Mossberg 590/Shockwave picatinny adapter rail mount is the perfect upgrade to your 12 gauge shotgun. This advanced, compact and light weight light mount attaches directly over the barrel lug, keeping it away from the barrel and allowing the removal of the magazine tube cap without having to remove the light mount! The mount set is made of lightweight and durable aluminum material, making it weather and water-resistant, as well as shockproof. The set includes a magazine tube/barrel lug mount with mounting hardware. This mount set is perfect for tactical use. The mounting location is on the rail and the tube diameter is 1 inch. Add this versatile mount to your Mossberg shotgun today!