The Ultradyne C4 Offset Front/Rear Sight Combo is a dual aperture sighting system that is changing the way shooters think about iron sights. The C4 Offset Rear Sight offers Rock-solid performance in a compact form with a ballistically calibrated elevation system that adjust in 50-yard increments from 200 to 600 yards. The C4 Offset Front Sight brings precision front aperture technology to back up iron sights along with the ability to adjust both windage and elevation. Using these sights together creates a perfectly concentric sight picture that allows the shooter to see the target, enables faster sight acquisition and gives the ability to consistently shoot accurately at targets close and far. C4 Offset Sights are your best option for back up iron sights. FeaturesOuter and inner concentric circles for easy target acquisitionWindage adjustable for zeroing on the front sight, which guarantees that the rear sight windage is perfectly centered when at zero for maximum in windage adjust...