Diamondhead’s revolutionary HOLE SHOT™ Integrated Sighting System takes sighting to a new level. With no button to unlock the sight from its stowed position, flip-up deployment is lightning-fast. If a fast, accurate CQC target acquisition is needed, simply level the apertures and use the round upper and reference bars for sighting. To stow, press down firmly and the uppers retract flat. Proprietary windage calibration is via a slotted screw that adjusts the rear sight’s upper housing. Hole Shot sights feature Diamondhead’s patented diamond-shaped apertures, base and housings and they carry a Lifetime Warranty.