I have a few of the Blue Force Gear's VCAS slings and just added the QD's to the sling.
It is a very good sling and you buy it in 4 or 5 versions, Padded, Non Padded, Metal or plastic hardware. Depending on budget and need.
This way if you change out your gun or attachment system you arnt stuck with a sling with only one options.
One Shot Tactical has them in stock for sure, Darren has done a few right ups on these slings as well as there are some great Youtube videos you can check out on them as well.
I also just leave a QD rings in the sockets and use the Magpul MS3 on one of my other rifles and this works just fine as well.