Re: pistol grip for ar 10
They should, in theory, fit. Some ambidextrous safety levers interfere with some grips, and there will be an extra spring for the rear takedown pin detent on all the variants I have seen that just rests on top of the grip and not in a hole like the safety selector detent and spring.
I really like the Hogue grip on .308 ARs (well, all ARs, but especially .308)