Vortex Viper HS-T VMR-1 Rifle ScopeExtra low dispersion XD glass increases resolution and color fidelity, resulting in crisp, sharp images. XR Fully Multi Coated Proprietary coatings increase 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