The SIII PLR 6-24×50 Zero-Stop rifle scope features a new internal zero-stop mechanism and a Second Focal Plane illuminated MOA-2 reticle. Designed for long range target shooting and hunting, the scope provides 100 MOA of windage and elevation with 0.25 MOA tactical knobs. The windage and elevation knobs have 20 MOA per revolution. The 30mm body tube is waterproof, shockproof and nitrogen charged. Minimum focus is 20 yards. The PLR (Precision Long Range) Series is designed to provide premium performance in an affordable package. All models sport a black satin finish with high visibility markings to quickly identify your scopes settings. The large oversized tactical knobs are easy to adjust in any weather conditions and are resettable to zero. The new internal zero-stop mechanism provides a tactile and audible positive stop for dead-on zero setting. Windage knob is marked for left and right so there is no second guessing when making adjustments. For superior performance, Sightron created a new Zact-7 Revcoat Plustm lens coating for a increased light transmission and improved clarity. Sightron?s patented ExacTrack Windage and Elevation system is standard on all models. All reticles in this series are illuminated with a side mounted 11 position off/on rotary type dial which uses the CR2032 Battery. The side mounted focus system has been redesigned for improved minimum focus performance.