Knight’s Armament AR-15/SR-15 QD Receiver End Plate Kit
KAC PN 22051-1
This KAC Carbine Receiver End Plate integrates a QD Sling Swivel Socket into either side for ambidextrous use. The QD Sockets are Non-Rotational, meaning they will not allow an installed swivel to spin freely within the socket, but instead give it a limited range of movement. Comes with end plate and traditional notched-style castle nut only. (KAC has since discontinued the dimpled nuts.)
Compatible with both SR-15/AR-15 and SR-25 platforms with a collapsible type receiver extension.