Sun Optics USA Mil-Dot Reticle 3-9 x 40 Ao Mag Proof Nitrogen Filled Airgun Tactical Rifle Scope 1-Inch Tube design Micro Mil-Dot Reticle Dry nitrogen filled and 100% waterproof, shockproof & fogproof Paralax adjustment from 10 yards to infinity Finger dial windage/elevation and excellent accuracy