Short answer yes!
You have three option for 3 point sling use and the ARFX Slings.
1. Use the existing rear sling point provided on the ARFX stock.
2. Use a rear sling designed for the CAR stock and attach to the upper stock tube.
3. Use a rear receiver endplate adapter.
I have tried all three methods and the all work. Here are my observations about each method:
1. I do not like the stock sling point. It does not swivel. Also the rifle butt may hang away from the body when released.
2. Works very good. Rifle hangs well when dropped. Was concerned it may slide on the foam, but have not had any problems with it doing so.
3. Also works well, but requires slight modification to the ARFX mount to fit. Again depending on the rifle, the butt may hang slighty away from the body.
Adam