Nikon P-223 3-9x40 Mate BDC 600 polymer Imported Generous, Consistent Eye Relief-Keeps your brow safeeven with the heaviest recoiling cartridges, lightweight rifles, and severe shooting angles. BDC 600 Reticle-Developed specifically for the trajectory of the .223 Rem /5.56 NATO round with 55-grain polymer tip bullet, the BDC 600 reticle offers shooters unique open circle aiming points and hash marks from 100 to 600 yards. Precise, 1/4-MOA Hand-turn Tactical-Style, Zero-Reset Turrets-Positive click reticle adjustments get you zeroed in quicker and maintain your settingeven withrepeated recoil. 100-yard Parallax Setting-Eliminates parallax for precise shooting. Waterproof/Fogproof-Nitrogen filled and O-ring sealed