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Seek a sling for range & hunting AR10 with Magpul PRS stock

I suggest you try my Tactical Intervention Slip Cuff Quick Release. Its 1.45" wide and designed exactly for what you want to do. More than a few are on SR25 type rifles in Afghanistan as we write this.

It has a quick adjustment feature.

Triad Tactical has it on his website
 
This is the Magpul solution which allows you to do a quick 1-point to 2-point conversion. One thing to keep in mind about all of these is apart from the sling you need specialized hardware to attach the sling to the two different points on the rifle so it does add up.

SLINGS & SLING MOUNTS - MS1? MS3? Adapter

I like this a lot and use it in 2-gun matches and on my SD gun.