Includes set of 30mm rifle scope mounting rings. Precision accuracy. Adjustment lock. Internal lit red or green reticle. US army Mil-dot reticle. Wide field of view. Precision multicoated optics. Internal lit reticle. Easy focusing knob. Front diopter adjustment. Lightweight. Waterproof and shockproof. Limited lifetime warranty. Magnification: 10-40x. Objective: 56 mm. Eyepiece diameter: 37 mm. Field of View (m@ 100m): 3.84-0.98. Field of View (m@ 100yds): 12.6-3.22. Exit Pupil: 5.6-1.4 mm. Eye Relief: 97.5-85 mm. Phase corrected, anti-reflective coating: wide band AR green. Parallax (yards): 10 to infinity. Illuminated Reticle: Yes. One piece tube diameter: 30 mm. Diopter (+/-): 2 to -3. Windage/ Elevation (MOA): 60. Mechanism of Action (one click): 0.13 in.. Windage/ Elevation lock: Yes. Focal Plane: 2 nd. Length: 16.7 in.. Weight: 900 g.. Instructions . The Sightmark 10-40 x 56 Triple Duty riflescope uses cutting edge glass and lens coatings to ensure that it is the most accurate tactical instrument on the market. Precision multicoated optics are the distinguishing feature of the Sightmark Triple Duty riflescope line; multicoated lenses offer the clearest view for easy target acquisition in both bright and low light situations. Locking mechanisms on the windage and elevation adjustments provide an additional level of accuracy and ensure that the scope stays zeroed. The 10-40 x 56s internal lit red / green Mil-dot reticle helps shooters to successfully make highly accurate shots over a wide range of distances.