With long eye relief, a fast-focus eyepiece, fully multi-coated lenses and resettable MOA turrets, there's no compromising on the Crossfire II. Clear, tough and bright, this riflescope hands other value-priced riflescopes their hat. The hard anodized single-piece aircraft-grade aluminum tube is nitrogen purged and o-ring sealed for waterproof/fogproof performance. Product Specifications Magnification: 4-12 x Objective Lens Diameter: 50 mm Eye Relief: 3.9 inches Field of View: 25.7-8.4 feet/100 yards Tube Size: 1 inch Turret Style: Capped Adjustment Graduation: 1/4 MOA Travel per Rotation: 15 MOA Max Elevation Adjustment: 50 MOA Max Windage Adjustment: 50 MOA Parallax Setting: 10 yards to Infinity Length: 14.2 inches Weight: 20.6 ounces