LWRC Sling Mount, Buffer Tube, Quick Detach, Ambidextrous, Black Finish 200-0072A01 The unique design features ambidextrous quick detach sling mounts and two set screws on the bottom of the unit. The first screw is a dog point screw that fits in the groove on the bottom of the buffer tube ensuring consistent alignment. The second" a pointed tip screw when installed grabs the castle nuts and eliminates the need to re-stake the castle nut. Includes one Daniel Defense quick disconnect swivel.