ATHLON SCOPE HELOS BTR G2 30MM 4-20X50 SF IR APLR6 MOA FFP FEATURES: Magnification 4-20 Objective Lens Diameter 50 mm Reticle APLR6 FFP IR MOA, Glass Etched Surface Finish Matte Lens Coating Wide Band Fully Multi-Coated Extra Coating Xtra Protective Coating Tube Material Aircraft Grade Aluminium Tube Diameter 30 mm Eye Relief 3.6 inches Field of View @100 yards 27.9-5.6 feet Click Value 0.25 MOA Adjustment range per rotation 25MOA Total Elevation Adjustment 100 MOA Total Windage Adjustment 80 MOA Turret Style Exposed Parallax Adjustment Side Focus – 10 yards to infinity Purging Material Argon Length 13.3 inches Weight 27.6 ounces