Diamondhead's Diamond Flip-up front Sight's patented Diamond-shaped housing allows for faster alignment, especially when integrated with the Diamond rear combat sight and the rear Sight's patented Diamond-shaped Apertures. The revolutionary design of the front housing creates a lightning-fast alignment of the front sight post in the center of the rear aperture. Works with DiamondHead (receiver height) gas block. Locking system ensures sight stays up securely and remains zeroed in combat situations. Secure and accurate elevation adjustment. DiamondHead Diamond front, rear and auto-ranger sights are designed to work together to create the DiamondHead integrated sighting system. Mil. Spec. Stainless steel and type 111 black anodized 6061 T6 Aircraft aluminum construction. Combat durable..