I use a separate QD on the rail rear, toward the upper receiver at 11 o'clock. Just can't bring myself to put a steel sling adapter swivel into my aluminum rail QD slot. Probably fine but thats just me. For the rear I use an IWC QD receiver end plate. I have used the QD on stocks but it just seemed to get hung up while doing drills. Never a problem with the end plate QD. I have my own, "Issued Sling". I used a black VTAC padded sling, unit purchased-issued, for 9 months in Afghanistan. When I was leaving country, Division gave me a coyote no-pad VTAC sling that I was able to keep. I use it with the QD on a few of my AR builds including my URG-I. It works for me.