Legendary Leupold performance in scopes specifically engineered for the AR-15 platform. The Mark ARs are built tough, deliver exceptional image clarity with Multicoat 4" lens systems, and are completely waterproof and fogproof. They offer 1⁄2-MOA T2 elevation and windage adjustment, and a special Bullet-Drop Compensation reticle calibrated for the 55-gr. .223 Remington/5.56 NATO round. Simply range the target, turn the scope dial to the corresponding range, hold dead-on and fire. It's that easy. These scopes have 1" tube diameters and are rigorously tested in the most demanding conditions by Leupold at its Beaverton, Ore. factory. Choose the 3-9x40 model with the BDC or conventional Mil-Dot reticle for long-range shooting. For tactical or mid- to short-range shooting, choose the 1.5-4x20.