Re: need ar10 but which one
GAP 10,POF,Noveske N6,SR25,LMT(Yes it's good,ask the Brits),Larue OBR are all great.
Sounds like you already have a great setup in a nice caliber that you love. Will it be a significant leap that's worth it?
What load are you shooting with the Grendel?
Best Regards