The Viper has earned its status as a premium riflescope. Incredible performance features like premium, fully multi-coated optics with 95 percent light transmission, heavy duty Precision Force spring systems and the glass smooth Precision Glide erector system. 6.5-20x50 riflescope is ideal for long range, predator/varmint, and target applications. Dead-Hold BDC reticle has a customized design that helps eliminate guesswork on hold-over and windage corrections. Good for any hunting or shooting at varying ranges where estimating hold-over would be a concern. Side knob parallax adjust allows quick and easy parallax adjustments with range numbers visible while in the shooting position. 30mm main tube offers improved windage and elevation adjustment along with greater strength. Tall capped turrets allow quick and easy field adjustments.