The Rail Mounted Fixed Loop (RMFL) allows a secure sling mounting loop to railed forends. The RMFL provides a solid and silent sling loop on MilSpec 1913 hand guard rails. The Rail Mounted Fixed Loop is issued with the USMC M27 Infantry Automatic Rifle and is also approved for use with the M4, M4A1, and M16A4. Fits- 1.25″ sling loop fits Vickers Combat Applications Sling and also works with 1″ slings. Made in the USA.