CNC machined sight post has integral crosshairs to provide quick, consistent sight alignment for improved accuracy at any range. Large diameter aperture offers a wide field of view that does not obscure target; gives a sight picture that's like looking through a scope. Compatible with factory rear sights and variable-diopter target sights. Non-hooded AR-15 sight is .082" thick. Hooded sight has .250" hood that shields crosshair from reflected light, offers greater crosshair protection for extreme duty use. Duplex, styled after the popular duplex scope reticle, improves low light visibility. AR-15 available as Hooded or non-hooded, fits M-16 and AR-10 rifles with standard sig Mfg: Kns Precision SPECS: Brass, black, matte finish. Beryllium crosshairs, heat treated. Duplex .010"/.020" (.5mm) wire. .240" (6.1mm) diameter aperture. HK 91 fits 91, 93, 94 MP-5, SP-89. 3/8" Dovetail height measured from top of base to center of sight.