DO NOT get the stupid bungy slings, if you have to jump, out of a vehicle, over something, drop and sling your AR off to your side it will nose dive the muzzle right in the dirt, mud, whatever.
I have a Vector Tactical SP quick hawser on three of mine, even my AK, same sling works three rifles in a single "clip"...
Also agree long hikes, marches, etc,...getting the second latch point is key across the chest. Vector has that option, and +1 on the Magpul...