Im far right, picture from Magpul Dynamic Carbine 1
Gear sector single point, with the QD end for my VLTOR AK stock.
I run Noveske end plates on my AR's so the sling works for them as well. I purchased an MS2 while at the course, and it works great with the noveske end plate and a bare QD swivel.
For the AR, I highly recommend the noveske end plate+ a gear sector single point with QD end, OR an MS2 with a bare QD swivel.
The other two guys rocking the single points in that pic are running MS2's, and they worked great. Just make sure you follow the directions for them so it doesn't come apart on you
Oh, if you do run a single point and are taking a 3 day course, it would be wise to bring something to put between your neck and the sling. After three days of having it on for almost 8 hours a day...they DO start to become a little uncomfortable. Either that or a nice underarmour polo or two would help as well.
Single points are the KING for classes like this, especially if your instructor is going to have you shooting from the reaction side.