How could or should the 6.5 mm Grendel be improved?

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Anyone thought about the concept of Olympic arms UMAR lower? It's a standard ar15 lower with the mag well machined out for a larger magazine. It works for the 22-250, I don't know about combat feasibility, but it works for civvies. I've pondered it for my extremely long throated Grendel. Just a thought.