The slide-on, anodized aluminum ERGO Sling Swivel and mount allows shooters to mount a standard rifle sling to any 1913 Picatinny rail. The adapter can be mounted to any location on 3″ 6″ or 9 o’clock rail. Install adapter at desired location by first loosening and removing cap screw with 3/32″ hex wrench. Next, use a wrench to loosen the set screw so adapter slides freely onto the rail. Slide the adapter to the desired position on the rail so that the set screw is aligned in a slot; tighten onto the rail with a wrench. Replace and tighten cap screw. When installed properly, the mount will rest on top of the rail with no gap.