ATN uses the purest grades of heavy glass and computer aided optical designs. All lenses are multi-element, high aperture and multi coated. Night vision devices utilize only the best hand selected Image Intensifier Tubes. Material range from titanium, aircraft quality aluminum to hi-impact plastic. All unit feature O-rings, nitrogen purging and hard exterior coating. Specifically designed for this potent rifle, the 12-36x80LU Day Vision Scope has a 1000 yard BDC and a 3,000 yard range finder built in. The custom designed mounting ring, which incorporates the BDC, insures easy and precise adjustments. 10 position illuminated reticle prevents you from losing sight of your reticle even in the darkest of conditions. The 80mm lens is one of the largest objective lenses available giving you the brightest image possible. Features: * Magnification: 12 - 36 x * Objective Diameter: 80 mm * Mounting: 30 mm Rings (not included) * Bullet drop calibers: .50 BMG * Rangefinding: 3,000 yards * Illuminated Reticle * Windage & Elevation Adjustments @100 yards: 1 click = 1/8 MOA All ATN units come with carrying cases, batteries, users manuals and instructional video. For all warranty claims, please contact ATN Warranty center directly at 1-800-910-2862 for repair or replacement. Non Returnable to Cheaper Than Dirt!