Nikon’s BDC 200 SlugHunter Reticle Designed for use with aerodynamic polymer-tipped slugs, this trajectory-compensating reticle integrates unique, easy-to-see “ballistic circles” that provide instant aiming points"and take the guesswork out of holdover at longer ranges. Multicoated Optical System Bright, multicoated optics deliver up to 92% light transmission. Five inches of constant eye relief Keeps your brow safe"even with heaviest slug loads while providing enough eye relief for cantilever type mounts. Precise, Hand-turn 1/4-MOA Click Adjustments Easy-to-use positive-click reticle adjustments get you zeroed in quicker and maintain your setting"even with heavy recoil. 75-yard Parallax Setting Eliminates parallax for precise shooting. Quick Focus Eyepiece Allows the shooter to instantly bring the reticle into sharp focus. Compact Size The perfect fit for high-caliber slug guns. Waterproof, Fogproof, Shockproof Nitrogen-filled and O-ring sealed.