The RSA provides a forward sling attachment point for the for the Magpul MS2 or MS3 and other clip-in systems. Made from nitrocarburized steel for wear and corrosion resistance, the RSA attaches to any MIL-STD-1913 Picatinny/STANAG 4694 rail and has been proven to withstand stress tests of over 300 pounds while only weighing a mere 1.3 ounces. Made in U.S.A.