BDC 800 Reticle: Developed specifically for the trajectory of the .223 Rem /5.56 NATO round with 55-grain polymer tip bullet, the BDC 800 reticle offers shooters unique open circle aiming points and hash marks from 100 to 600 yards. 100-yard Parallax Setting: Eliminates parallax for precise shooting.Precise, 1/4-MOA Hand-turn Tactical-Style Turrets: Positive click reticle adjustments get you zeroed in quicker and maintain your setting—even with repeated recoil. Fully Multicoated Optical System: Provides up to 98% light transmission and maximum brightness from dawn to dusk. Zero-Reset Turret Feature: To simplify field adjustments, Nikon has integrated this feature into all new riflescopes. Just sight-in as usual, then lift the spring-loaded adjustment knob, rotate to your “zero”, and reengage. Field adjustments are now as simple as dialing-in your subsequent ranges.