The Diamondback Tactical Scope 4-12x40 has exposed tactical turrets built for dialing elevation and windage allow quick and precise bullet drop and wind drift compensation at extended ranges. A zero-reset feature lets you re-index the zero reference marks on both turrets after sight in, while fiber optic rotation indicators integrated into the turrets provide a visual cue of your turret's position. 1" tube size is graduated in ╝" adjustments and has 70 MOA elevation and windage adjustments. Extra-low dispersion (XD) glass increases resolution and color fidelity, resulting in crisp, sharp images. Proprietary coatings increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. Scale of reticle maintains the same ideally-sized appearance. Listed reticle sub-tensions used for estimating range, holdover and wind drift correction are accurate at the highest magnification. Scope is constructed from a solid block of aircraft-grade aluminum for strength and rigidity. O-ring seals prevent moisture, dust and debris from penetrating the riflescope for reliable performance in all environments. Rugged construction withstands recoil and impact. Nitrogen gas purging prevents internal fogging over a wide range of temperatures. Scope is 14.2" long and weighs 16.2 oz. Made by Vortex«.