For those that want to use their SCAR's sling attach points but don't want the metal-on-metal contact...
At $14, you don't have to use the sling. The two plastic sling loop attachments with paracord are the key components. Just use them with your own preferred sling. The sling that you use might need to have 1 1/4" wide ends though.
Loop them through your SCAR's sling attach points and you are good to go.
I bought mine here...
http://www.slingsonly.com/m4instructions.html