Looking to use it for shooting or just to carry the rifle? For shooting, which also works for carrying, I like the Tactical Intervention Quick Cuff sling set up. I use it on all my rifles now. I like the cuff as it doesn't seem to slip like some of the other versions do when slung up for more than one or two shots. I can also get it tighter as well. When not in use the cuff is held to the sling by elastic straps. You can see it in the second pic below. Tactical Intervention Specialists Rifle Slings and Accessories
Here's an old picture of it in use. Must be around 2005. I also use the sling on my large ARs as well.