The Ultradyne C4 Folding Front and Rear Sight Combo, 7.62/.308 delivers an aiming system that more clearly matches how your brain would prefer to process information. Paired with an innovative ballistic system for the 7.62/.308 rounds, you have perhaps the most accuracy-minded sight system available for your AR10 platform. The Ultradyne C4 Folding Front and Rear Sight Combo pairs the circle-within-a-circle aiming system with a ballistic calibration system that will keep you on target from 200 to 600 yards in 50-yard increments. While you might think that kind of ballistic calibration is only possible with traditional optics, you would be mistaken. Flip-up design Mounts Mfg: Ultradyne Usa