Ultradyne C4 Flip-Up Rear Sight Picatinny Mount Black. Creating a purely concentric sight picture with an inner aperture and outer circle you can acquire and switch targets quickly and easily. The elevation adjustments are for every 50 yards up to 600 yards and they match the ballistics paths of standard M193 ammo so you can count on consistent results. They Ultradyne C4 Flip-Up Rear Sight even have an interchangeable 0.070" Aperture and Ghost ring for further customization. Specifications for Ultradyne C4 Flip-Up Rear Sight: Manufacturer: Ultradyne Color: Black Condition: New Sight Mounting Orientation: Top Mounted Sight Position: Rear Gun Make: AR Platform Front Sight Color: REAR SIGHT ONLY Rear Sight Color: Black Deployable: Yes Fabric/Material: 4140 CrMo Steel 7075 Aluminum Included Accessories: None Illumination Color: None Hand: Ambidextrous Mount Type: Picatinny Country of Origin: USA Attachment Type: Picatinny Features of Ultradyne C4 FOLDING REAR SIGHT: Purely concentric sight picture with an inner aperture and outer circle for easy alignment Elevation Adjustments that match ballistics paths of standard M193 ammunition Elevations adjustments in 50 Yard increments out to 600 Yards 18 MOA total Windage-Adjustable with positive location marks 1/2 MOA/Click Interchangeable .070 Aperture and Ghost Ring Spare aperture conveniently stores into windage knob Strategic use of materials to maximize stregnth and minimize weight 4140CrMo with Nitride Finish / CNC Machined 7075 Aluminum Package Contents: Ultradyne C4 Flip-Up Rear Sight Ultradyne UD10400: C4 Flip-Up Rear Sight Picatinny Mount Black