If one wants to carry the rifle at ready / fighting sling, then I would ( and have ) go with the BFG Vickers slings. I have used them for years and have them on several weapons at work also.
DaveP, thats our sort of "Icelandic" version if one does not want/need the gun rest feature based on terrain etc. Some early critical commentry, mostly online with no hands on yet, focused on "not wanting to wrap yourself around a tree"
Again it is not the only good feature and only comes with less than 2 oz weight increase, if one happens to need the extra support for making a shot. I would also emphazise the carrying comfort and security of the sling, especially suppressor equipped rifles can be prone to shifting around if carried with a traditional sling.
We do also now have a Picatinny mounting version as well.
RECON - Always a step ahead