Palmetto State Armory, your source for Vortex Optics!! Viper PST (Precision Shooting Tactical) riflescopes are packed with the very best features. Developed on industry technology, design and understanding and the voice of the consumer, the Viper PST series delivers. Features include:matching reticle and turret measurements for quickly dialing in those quick shots and professional-grade illuminated reticles for all light conditions. For accuracy, dependability and performance, choose Vortex.