Leupold Mark AR was designed for the hunters and any other shooters who use AR15 and M16 style rifles. Leupold uses Quantum Optical System and Malticoat 4 technologies in their Mark AR rifle scopes to obtain bright, clear and sharp image. . All hunters constantly say that Leupold’s optics gives clearest image than most scopes of other manufacturers. Mark AR rifle scopes equipped with MOD 1 P5 adjustment knobs. These knobs feature finger clicks with 1/10 (0.10) mil increments through 6 mils adjustment range. Unfortunately this knob does not feature zero stop and revolutions. P5 knob feature bullet drop compensation (BDC). It has numbers that refer to the yardage. All you need is to set appropriate distance and make a shot using center of the reticle for aiming. I bought last year $349 Text 503-290-8282 for offer !