The BCM(R)(TM) RSM Picatinny Rail Sling Mount Fits standard 1913 Picatinny rail interface. Accepts standard QD (quick detachable) push button sling swivels (not included). Non-rotational locking interface. Requires two lugs and one 1913 slot to mount properly. All steel construction. Includes hex wrench. Like all BCMA(R) weapons and accessories, Made in the USA.