Ultradyne C4 Folding Front and Rear Sight Combo 7.62/.308 Black. The innovative four concentric circles create a sight picture that optimizes accuracy. Specifications for Ultradyne C4 Folding Front and Rear Sight Combo: Manufacturer: Ultradyne Color: Black Gun Make: AR Platform Fabric/Material: 416 SS with Nitride Finish/6061 Aluminum Hard Coat Anodized/CNC Machined 7075 Aluminum Gun Type: Rifle Illumination Color: Red Hand: Right Last Chance: Yes Mount Type: Picatinny Features of Ultradyne C4 Folding Front and Rear Sight Combo Purely concentric outer and inner circles on both front and rear sights for target acquisition Windage-Adjustable for zeroing the front sight which guarantees that the rear sight windage is perfectly centered when at zero for maximum in windage adjustment in either direction along with easy return to zero Tool-less elevation adjustment that is always perfectly concentric with the outer circle Dual aperture sighting system allows the shooter to focus 100percent on the target Rear Sight elevation adjustments that match the ballistic path of standard M80 ammunitionRear sight elevations adjustments in 50 Yard increments out to 600 Yards Interchangeable .070 Aperture and Ghost Ring Spare aperture conveniently stores into windage knob Strategic use of materials to maximize strength and weight 416 SS with Nitride Finish / CNC Machined 7075 Aluminum 416 Stainless Steel with SB Nitride Coating Package Contents: Ultradyne C4 Folding Front and Rear Sight Combo Ultradyne UD11250: C4 Folding Front and Rear Sight Combo 7.62/.308 Black