The Rear Sling Mount is made of high-quality steel with a Black Oxide finish. It was designed for the AR15/M16 full-length rifle stock, but will fit some collapsable stocks with no required modifications to the rifle. The Rear Sling Mount allows a sling swivel to be attached to the rear of the stock in two positions, in-line with the stock or perpendicular to the stock. It replaces the rear sling loop and attaches with the original bottom butt plate screw. Due to manufacturing differences and specifications in current collapsable stocks, the Rear Sling Mount may not fit your collapsable stock.