vortex viper pst 5-25x50 ebr-2d mrad (ffp) pst-5257 vortex vortex's viper pst riflescopes boast of the features and performance serious shooters demand. born from an intimate understanding of riflescope design, forward-thinking engineering, and open ears to a market incredibly vocal about what it wants in a riflescope, the viper pst series delivers. the viper pst from vortex offers top-tier performance in a riflescope designed and built to the standards precision tactical shooters request. quickly and accurately dial in shots with matching reticle and turret measurements. professional-grade illuminated reticles are designed for daytime, low light, and nightvision devices. the illumination control can be turned on or off with a single click between each intensity level. optically indexed lenses deliver optimum edge-to-edge image sharpness and brightness. best of all, it's backed by vortex’s vip unlimited lifetime warranty.