Better late than never, I worked on that myself this fall.
I bought a Magpul, a BF Vickers, & a no name Ebay sling, plus 2 fistfuls of swivels, sockets, mounts etc.
So glad I've got my AR's, & a shotgun better squared away. Only now do they seem finished. Now working on ways to bundle up, on the gun, those long slings when they're not in in use. Heavy rubber bands, velcro etc. Keep the sling from getting hooked on things, but still on the gun & quick to deploy.