Magpul UBR QD Swivel Sling Mount
While the UBR comes with two push-button QD swivel sockets on the left side of the stock, the UBR QD Swivel Mount can be added to the right side (either front or rear) to add additional push-button sling swivels. Heavy-duty black phosphatized steel construction easily installs with stock's original hardware.
Swivels not included.
Made in U.S.A.
NOTE: The UBR QD Swivel Mount is NOT compatible with the ACS Stock.