Single Side QD Socket for the KP-15 Installs in circular hole on buttstock close to pistol grip. Installs with single screw and washer. Use of blue locktite is recommended (blue locktite not included). This QD Socket is NOT anti-rotation. Putting two back to back does not work to have sockets on both sides. The screw head on one side will interfere with the QD. Made in the USA from steel and Melonite coated. Mfg: Ke Arms