Rugged, flip-up sights provide failsafe backup when your primary optic or red dot sight fails. Deploys easily and locks securely in place under powerful spring pressure and two locking detent balls, so it can’t be accidentally bumped down until you hit the spring-loaded button on the left side of the base to retract it. Positions apertures at the same height as factory sights, simplifying integration of these sights on your rifle. Base clamps securely to any military or commercial Picatinny rail using a standard flathead screwdriver - no knobs or levers to catch on brush, clothing, or other gear. Protective “ears” shield posts and apertures from impact. Rear sights bolt to flattop receiver rail and are only .460" high when folded. Detent-locking adjustment wheel lets you change the windage setting in ½ MOA increments. HK-Style Rear - two same-plane apertures: large .190" aperture provides a wide field of view for close-in targets, while .070" aperture is calibrated for engaging long-range targets. Also available with a Tritium dot on each side of large aperture. DOA Rear - diamond-shaped Di-Optic Aperture (DOA) works like invisible crosshairs to center the eye for lightning fast target acquisition. Same-plane aperture has two settings, for targets out to 300 meters and out to 550 meters. Front sights clamp to handguard accessory rail and are only ½" high when folded. All models have M4-type post that’s elevation adjustable in ½ MOA increments. HK-Style Front - distinctive “globe” shape that aids in fast target acquisition under stress. Also available with a self-illuminating Tritium dot on the post for precise shot placement in low-light conditions. M4/M16-Style Front - deep grooves on housing ensure a firm grasp for fast deployment.