Diamondhead® DIAMOND Rear Combat Sights incorporate the unique, (Pat. & Pat. Pend.) Diamond-Shaped Apertures. When paired together, the DIAMOND Rear Sight and complementary DIAMOND Front Sight work together to create a fully integrated sighting system that allows the eye to place the front post perfectly in the center of the rear aperture. The re-styled Rear sight's Diamond-shaped upper housing permits rapid close quarter aiming with the apertures flat.