Harris makes a #5 stud mount adapter for ARs that will work on the stock round 10 hand guard. I just bedded in the plate with acraglas. I use the Harris S-25 swivel bipod.
Have only shot it with the bipod a couple of times, so am still determining how much, if any POI change there will be. But shooting off a bedroll doesn't seem to matter much, and the same setup on a 5.56 carbine seems to maintain a very usable POI consistently out to 300.
I suspect that my position and trigger control with the bipod--which, frankly, I am still getting used to--are the principal variables in my case. Both rifles will outshoot me, if it comes to that...