Magpul RSA Rail Sling Attachment MAG502. These Slings by Magpul Industries are constructed from nitrocarburized steel for ultimate wear and corrosion resistance and have been proven to withstand stress tests of over 300 pounds. Weight only 1.3 ounces this Magpul Sling Attachment is mighty powerful. Specifications for Magpul RSA Rail Sling Attachment: Manufacturer: Magpul Industries Condition: New Features of Magpul RSA Rail Sling Attachment MAG502: All steel construction Works on any MIL-STD-1913 Picatinny/STANAG 4694 rail Case hardened and finished with a ferritic nitrocarburizing process for extreme resistance to wear and corrosion Package Contents: Magpul RSA Rail Sling Attachment 55-CS-MAG502 MAGPUL MAG502: RSA Rail Sling Attachment