CROSSFIRE II 6-24X50 AO RIFLESCOPE 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. OPTICAL FEATURES Fully Multi-Coated Increases light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. Second Focal Plane Reticle Scale of reticle maintains the same ideally-sized appearance. Listed reticle subtensions used for estimating range, holdover and wind drift correction are accurate at the highest magnification. CONSTRUCTION FEATURES Tube Size 30 mm diameter. Single-Piece Tube Maximizes alignment for improved accuracy and optimum visual performance, as well as ensures strength and waterproofness. Aircraft-Grade Aluminum Constructed from a solid block of aircraft-grade aluminum for strength and rigidity. Waterproof O-ring seals prevent moisture, dust and debris from penetrating the riflescope for reliable performance in all environments. Fogproof Nitrogen gas purging prevents internal fogging over a wide range of temperatures. Shockproof Rugged construction withstands recoil and impact. Hard Anodized Finish Highly durable low-glare matte finish helps camouflage the shooter's position. Capped Reset Turrets Allow re-indexing of the turret to zero after sighting in the riflescope. Caps provide external protection for turret. Adjustable Objective Adjustment for riflescope's objective lens provides image focus and parallax removal. CONVENIENCE FEATURES Fast Focus Eyepiece Allows quick and easy reticle focusing. Magnification 6-24 x Objective Lens Diameter 50 mm Eye Relief 4.0 inches Field of View 17.3-4.4 feet/100 yards Tube Size 30 mm Turret Style Capped Adjustment Graduation 1/4 MOA Travel per Rotation 15 MOA Max Elevation Adjustment 40 MOA Max Windage Adjustment 40 MOA Parallax Setting 10 yards to infinity Length 14.5 inches Weight 23.6 ounces