Vortex Diamondback Scope The Diamondback - is loaded with features! First, the solid one-piece aircraft-grade aluminum alloy construction makes the Diamondback riflescope virtually indestructible and highly resistant to magnum recoil. Argon purging puts waterproof and fog proof performance on the agenda, and advanced fully multi-coated optics raise an eyebrow when crystal clear, tack-sharp images appear in the crosshairs. Look for all this and more in a riflescope you'd expect to cost quite a bit more-but doesn't. We can live with that. Customized dot design helps eliminate guesswork on holdover and windage corrections. Good for hunting/shooting at varying ranges where estimating holdover is a concern. Diamondback 4-12x40 Scope Specs Magnification: 4-12x Objective Lens Diameter: 40 mm Eye Relief: 3.1 inches Tube Size: 1 inch Turret Style: Capped Adjustment Graduation: 1 MOA Travel Per Rotation: 15 MOA Max Elevation Adjustment: 60 MOA Max Windage Adjustment: 60 MOA Parallax Setting: 100 yards Length: 12 inches Weight: 14.6 oz Included: Removeable lens covers, lens cloth Diamondback 4-12x40 Scope Features Proprietary coatings increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. The scale of the 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. Rugged construction withstands recoil and impact. Maximizes alignment for improved accuracy and optimum visual performance, as well as ensures strength and waterproofness. O-ring seals prevent moisture, dust, and debris from penetrating for reliable performance in all environments. Highly durable hard-coat anodization provides a low-glare matte surface and helps camouflage the shooter's position. Argon gas purging prevents internal fogging over a wide range of temperatures. 1-inch diameter tube offers a versatile blend of adjustment, size, and weight for a wide variety of shooting applications. Allows quick and easy reticle focusing. This system ensures the components in the zoom lens mechanism glide smoothly and cleanly through all magnification ranges. Constructed from a solid block of aircraft-grade aluminum for strength and rigidity. Your Satisfaction with Vortex is Guaranteed: Unlimited Lifetime Warranty Free Shipping & No Sales Tax in the U.S.