TRUGLO TRU-Brite 30 Series 1-4 X 24mm Rifle Scope with Mount 1-4 x 24mm objective lens; Nitrogen gas-filled; 3.5-inch eye relief True 1x magnification for EXTREMELY FAST SIGHT PICTURE; Duplex mil-dot reticle ONE-PIECE AIRCRAFT-GRADE ALUMINUM TUBE; water & shock resistant; fog-proof; LIMITED LIFETIME WARRANTY INCLUDES REVERSIBLE, OFFSET, MONOLITHIC 30MM SCOPE MOUNT made of CNC-machined aircraft grade aluminum; Includes 2 precalibrated BDC turrets in calibers .223 (55 grain) and .308 (168 grain) to engage targets up to 800 yards away MIL-DOT RETICLE enables user to determine the distance of objects of a known size and provides quick trajectory and wind drift aiming reference