Magpul Sling Mount Kit - Type 2 MAG332

While both the UBR and STR come with reversible push-button QD swivel sockets pre-installed on the left side of the stock (UBR comes with two, one front and rear), the UBR/STR QD Swivel Sling Mount can be installed on the opposite side 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 the USA.