Atlas Bipods Side Mount Sling Studs for Magpul PRS replaces strap bolt 2 Black. The threaded straps that come standard with the PRS can be reversed giving a total of 8 choices for stud placement. Each comes with two Sling Studs having 10-24 threads and black polymer spacers. Weight .5 ounce. Specifications for Atlas Bipods Side Mount Sling Studs for Magpul PRS replaces strap bolt 2: Manufacturer: Atlas Bipods Color: Black Package Contents: Atlas Bipods Side Mount Sling Studs for Magpul PRS replaces strap bolt 2 Atlas Bipods BT14 Side Mount Sling Studs for Magpul PRS replaces strap bolt 2 Black