THIS MODEL HAS A NON-ROTATIONAL QD SLING MOUNT AS PICTURED. THERE IS NO RAIL ON THIS PRODUCT TO ATTACH ADDITIONAL ACCESSORIES. THE SERRATED AREA AT THE BOTTOM OF THE PRODUCT IS THE "STRIKE PLATE" WHICH IS INTENDED FOR CLOSE QUARTER COMBAT. Machined from billet 6061 aluminum and plated with MIL-A-8625F, Type III, Class 2, Black Anodize. Available with steel anti-rotational QD Mount (shown). Shipped units have black Zinc coating on the steel component. Easy installation with two ¼-20 set screws which are included. No drilling required. Fits Magpul PRS Gen I & Gen II stocks. This product is not compatible with the Magpul PRS Gen III stocks.