The Nightforce Competition SR Fixed 4.5x24mm riflescope is designed for one purpose: service rifle competition. Each 1/4 MOA click of the windage and elevation knobs engages with a reassuring tactile feel and, as with every Nightforce riflescope, tracks true and without backlash. The Competition SR Fixed 4.5x24mm riflescope is equipped with Nightforce's ZeroStop elevation control for an instant, positive return to your pre-set zero, regardless of how many intervening elevation adjustments you've made. Parallax is fixed at 200 yards, providing a parallax-free image for all service rifle and high-power distances. 100 MOA windage / elevation adjustment range Fi Mfg: Nightforce