This is a Bravo Company known as the Picatinny, model BCM-RSM-1913.
Bravo Company's BCMGUNFIGHTER Picatinny Rail Quick Detachable Sling Mount fits standard 1913 Picatinny Rail interfaces. Accepts standard QD (quick detachable) push button sling swivels (not included) and has a non-rotational locking interface.
Features:
Requires two lugs and one 1913 slot to mount properly
All steel construction
Includes hex wrench
