I'm in the same boat, looking for sling studs to run a simple 2 point sling from one of my regular bolt action hunting rifles also. What's the best way to attach to the front of an AR? I noticed in my DPMS that there are a few holes on the bottom of the gas block, but didn't look closely enough to see if they're threaded.
***EDIT*** Just saw that Magpul makes some pretty decent looking slings that come w/ all the hardware I'd need to get set up. I've got a Magpul MOE hand guard also, what's the best way to mount a sling to that hand guard? It appears the Magpul MS3 Single QD Sling GEN2 or the Magpul MS4 Dual QD Sling GEN2 would be the two I'm interested in but still not sure how to mount the front part of the sling onto my MOE hand guard...