Drop Zone-223 BDC Ballistic Reticle is calibrated for 55-62 grain, 223 REM/5.556 loads with aiming points out to 500 yards * Side focus parallax adjustment for adjustable long-range accuracy and a fast-focus eyepiece * Target turrets (1/4 MOA click value) for pinpoint precise adjustments * Fully multi-coated optics for incredible brightness * Made of high-durability aluminum alloy, anodize-finished and sealed to protect the inside from elements