Hammers Reflex CQB Red Dot Sight 2X42AR w/ 2x Power Adapter Lens Integral Reversible 7/8 Weaver 3/8 Dovetail Mount CQB circle plus dot reticle reflex sight Two color (green and red) illumination for the best contrast setup against the target Screw-on 2x adapter lens Integral reversible mount fits onto both 7/8" Weaver and 3/8" dovetail rails 28mm center height