Magpul RSA Rail Sling Attachment - This forward mount low profile sling attachment will secure to any 1913 style Picatinny rail. Made from nitrocarburized steel makes this sling attachment corrosion resistant. It has withstood stress tests over 300 lbs but weights a mere 1.3 oz. Made in USA. Weight: 1.3 ozAll Steel constructionFits Picattiny railCase hardened