Attached scans are from the Magpul MS3 Sling shipping pack. A lot of information on line, YouTube etc and this is just another source and may help others. I like the Gen 3 Sling set up. With the single step locking and quick disconnect it works for me. YMMV
Just found this. Nice and thanks for the scans @HK_User I run MS3 slings on all of my M4s I see the Gen 4 has a plastic slider instead of the adjustment loop.