Trijicon's longest-range AccuPoint scope, it gives tactical shooters, varmint hunters and law enforcement snipers the ability to accurately extend their range in any light. Advanced fiber-optics and tritium aiming-point illumination speeds target acquisition and extends available shooting hours Dual-illumination system automatically adjusts aiming-point brightness to existing lighting conditions Manual brightness override allows shooters to easily adjust the reticle to suit their preferences 30mm tube offers a greater range of mounting options Rugged, aircraft-quality, hard-anodized aluminum body offers all- weather protection Unmatched long eye relief protects against the recoil of higher caliber rifles Easy-to-use external turret controls for windage and elevation adjustment Side parallax adjuster for enhanced accuracy at long range.