30mm 1 piece tube for maximum light transmission; Built on true strength platform, completely sealed and nitrogen filled, shockproof, fogproof and rainproof; Provides amazing, true and consistent extended eye relief for shooters to effectively use on any firearm where the optics cannot be mounted directly above the action; Innovative EZ-TAP illumination enhancing (IE) system with Red/Green dual-color mode and 36 Color Multi-color mode to accommodate all weather/light conditions (U.S. Pat. 8,437,079; EU patent pending); 1-click high-tech illumination memory feature gets you right back to the color/brightness setting last used; Premium zero locking and zero resetting target turrets with most consistent and precise 1/4 MOA per click windage/elevation adjustment; Emerald coated lenses to achieve maximum light transmission for best clarity; Unique 6 Mil-dot Tactical Range Estimating (TRE) etched glass reticle for the ultimate performance; Side Wheel Adjustable Turret (SWAT) for parallax adjustment from "true 10 yards" up, and ready to accept optional big wheel to achieve finer parallax adjustment; Practical TactEdge angled integral sunshade