FAB Defense Aluminum Sling Picatinny Attachment for 1913 Mil-Std Picatinny Rail Accepts All Slings up To 1" (25mm) Made from 6061 Aircraft Grade Aluminum, CNC Machined (will last FOREVER); Hard Black Anodized Ultra Light Weight Mounts To Any 1913 Mil-Std Picatinny Rail Easy to Install With One Locking Bolt The SLA Sling Picatinny Attachment connects front part of the sling to your Picatinny rail.