So, the above gives you lightweight, no cost attachment points for conventional QD slings. Work very well.
If you don't love how a sling works with the Magpul attachment points, and I don't, there's something else you can do.
If you wrap a shoelace or leather thong 2-3 times around the barrel, it will bind and stay roughly in place. Then you will have a place to mount a sling just above the plastic forend, near the base of the barrel, for an entirely conventional rifle sling scenario. This has been hugely better for me. I haven't determined whether this causes any loss of zero, which it very well might. Loss of zero already being a possible problem with the takedown system when using receiver mounted Tech-Sights or similar.
(The Tech-Sight TSR 100 is fantastic, and worth some loss of zero to me; I think the TSR 200 might be a better choice for the takedown, because of the easier sight adjustment.)