Gen 3 Compatible, Accepts Polymer80 frames, Machined from 416R Stainless steel, Cerakoted Graphite Black, Machined for precise fitment of a Trijicon RMR, Slide Cover plate and screws included, Channel liner not installed or included, Torque screws to a maximum of 10-12 in/lbs. 1 drop of blue loctite is also recommended, Screw size 6-32 X 7/16"