Extra-low dispersion (XD) glass increases resolution and color fidelity, resulting in crisp, sharp images; Fully Multi-Coated Lenses; 30 mm diameter provides maximed internal adjustment and strength; Constructed from a solid block of aircraft-grade aluminum for strength and rigidity; Tactical windage and elevation turrets with Zero Reset making adjustments back to zero easy and quick; Fast Focus Eyepiece allows quick and easy reticle focusing; The raised rib on the magnification ring facilitates fast magnification changes in the heat of action; EBR-2C Reticle (mrad); Highly durable low-glare matte finish helps camouflage the shooter's position; Nitrogen gas purged and o-ring sealed for fogproof and waterproof performance in all conditions