The Sightmark tactical rifle scopes use cutting edge glass and lens coatings to ensure that they are the most accurate tactical instruments on the market. Precision multicoated optics are the distinguishing feature of the Sightmark tactical riflescope line; multicoated lenses offer the clearest view for easy target acquisition in both bright and low light situations. Both waterproof and fog proof, the nitrogen filled Sightmark tactical line features oversized windage, elevation and focusing adjustment knobs for easy adjustment in the field. Locking mechanisms, available with the 8.5-25×50, on the windage and elevation adjustments provide an additional level of accuracy and ensuring the scope stays zeroed while the internal lit mil-dot reticle helps shooters to successfully make highly accurate shots over a wide range of distances.