Made in the USA, the RSA (Rail Sling Attachment) provides a low profile forward sling attachment point 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 1913 Picatinny rail and has been proven to withstand stress tests of over 300 pounds while only weighing a mere 1.3 ounces.