Ultradyne C4 Rear Sight Aperture

Same size as that included with the C4 Rear Sight, choose this if you need to replace yours. Equivalent to the smaller of the standard A2 flip apertures. Specifications for Ultradyne C4 Rear Sight Aperture: Manufacturer: Ultradyne Sight Position: Rear Front Sight Color: REAR SIGHT ONLY Rear Sight Color: Black Fabric/Material: 4140 CrMo Steel Finish: Nitride Color: Black Package Contents: Ultradyne C4 Rear Sight Aperture