Dial in your exact holdover and windage using the precise 1/10 mil and zero click stop turrets while side parallax adjustment allows fine tuning focus to get the most out of the front focal plane special-competition SCR 2 Mil reticles. Capable of 80 MOA total elevation travel, the new RT-15 rifle scope is built around a rugged 30mm nitrogen filled tube and is waterproof, shockproof and fog proof. Like all Burris scopes this was designed to handle recoil from any direction making it a perfect option for competition air gunners.