Vortex Optics riflescopes boast extreme durability, high mechanical precision, and superior high-definition optics. The Diamondback 3-9x40 Riflescope was carefully crafted and meticulously designed to make this rifle scope the ideal optical solution for a long range applications. The Diamondback 3-9x40 Riflescope (Dead-Hold BDC MOA Reticle) brings you exceptional image quality thanks to the optical glass. The 40mm objective lens features a BDC reticle that offers shooters highly functional, intuitive, and detailed hold points, yet remains uncluttered for optimal viewing. The Vortex Diamondback Riflescope comes with Vortex Optics' VIP Warranty.Superior OpticsDiamondback 3-9x40 Riflescope lenses are fully multi-coated with anti-reflection coatings for maximum light transmission and minimum glare on all air-to-glass surfaces. The lens provides higher color contrast, sharper images, and superior light transmission. The glass-etched reticle was precision etched in the second focal plane for an image that always maintains the same ideally-sized appearance. It designed to provide precise aiming even at the longest range and lowest light conditions.Dead-Hold BDC ReticleThe Diamondbacks Dead-Hold BDC aiming reticle is designed to help eliminate guesswork on holdover and windage corrections. This type of reticle is good for hunting or other types of shooting where you will be aiming at targets across very long distances. The Dead-Hold reticle can be used effectively with high powered rifles, rimfire rifles, black powder rifles and slug shotguns. The BDC Reticle is constructed in the second focal plane and maximizes long-distance shooting and ranging abilities for your Diamondback Riflescope. The reticle was marked using MOA based subtension lines as a reference for bullet-drop as well as bullet drift in windy conditions; the ultra-precision laser etching on the glass reticle is kept to the tightest tolerances possible. The BDC reticle has a max windage adjustment level of 65 MOA and a max elevation adjustment level of 65 MOA.Durable BuildConstructed out of aircraft-grade aluminum, this Vortex Optics Riflescope has a tube size diameter of 1 inch in a single-piece tube designed to maximize alignment for improved accuracy and optical performance. A tough hard-coat anodized exterior combines with ArmorTek exterior coating to help protect your scope protects against bumps, bruises, scratches, oil, and dirt. O-ring seals and Argon gas purging create a waterproof, dustproof, and shockproof body.Internal MechanismsCapped turrets give you extreme control for fast and accurate elevation and wind adjustments thanks in-part to the integrated locking mechanism that prevents accidental adjustments. The Precision-Glide Erector System ensures components of the zoom lens mechanism glide smoothly and cleanly through the entire magnification range.