Top-tier performance for tens of thousands of rounds – experience true optical excellence. Eye Box technology offers 4X zoom range, 4" of constant eye relief, a huge ocular lens, generous field of view and locking side-focus parallax adjustment for any distance (for models exceeding 10X). A BDC reticle allows hunters to hold on target at incredible distances, yet allow a normal sight picture at shorter ranges. The Ultra ClearCoat® Optical System gives maximum light transmission up to 95% – perfect for early and late hunting. Hand-turn 1/4-MOA reticle adjustments. Enhanced mount ring spacing lets you mount to virtually any rifle, regardless of caliber. Lifetime warranty. 1" main-tube construction.