Diamondhead DIAMOND Flip-Up Rear Combat Sight & Front Sight Front Sight Folding<br />Diamondhead's Flip-Up Rear Sight's revolutionary design incorporates the original and proprietary Diamond-Shaped Apertures and a re-designed upper housing - allowing the eye to place the front sight post in the exact center of the rear aperture... faster and with greater precision. The Diamond-shaped upper housing enables rapid CQC with the apertures flat. The DIAMOND sight is compatible with all Diamondhead VRS Drop-In and Free-Floating Handguards or any Mil. Std. M1913 Picatinny rail systems.