From tree stands to mountain tops, the Vortex Viper HST riflescope line reigns supreme. All of the optics in the Viper HST series features a forgiving eye box for reduced strain on the shooter's eye, as well as XD glass and XR fully multi-coated lenses to enhance light transmission and clarity. Other features include exposed tactical-style turrets for making quick adjustments in the field, and the CRS Zero Stop allows for a quick and easy return to the original zeroing.