Match Grade Rear & Front A2 Sight Post Features The Removable Rear Sight clamps solidly onto the rail with one "QD"-Quick Detach thumb-nut with retention design and features a superior locking plate to ensure zero movement so that once you set your zero. The rear sight includes a dual aperture rear sight dually serving long and short-range adjustment with 1/2 minute increments for exact precision adjustments of windage and elevation. Front Sight is 1.75" Height, Same plane as the rear sight for flat top rails Constructed of aircraft aluminum with hard anodized finish. All aluminum parts are Manganese Phosphated for corrosion resistance. Top notch quality at an unbelievable price point. No gunsmithing is required.