Leupold Mark 4 ER/T 8.5-25x50mm (30mm) M1 Front Focal Mil Dot Long-range/tactical riflescope with 8.5 to 25x magnification and 50mm objective lens Index Matched Lens System offers unsurpassed sharpness, brightness, and contrast Side-focus parallax adjustment for fast, easy parallax focusing from 75 yards to infinity Mil Dot reticle; rugged 30mm main tube and fully waterproof construction Standard issue flip-open lens covers; measures 14.5 inches; weighs 22.5 ounces