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As far as I'm aware that's only an ar-10 clambering. There is no mil spec for ar-10s so your best bet is to buy a matched upper and lower.

6.5 Creedmoor requires a longer AR 10 receiver that is 308 length the AR 15 receiver is just to short for it while the 6.5 Grendel will work with the AR 15 receiver.

only Ar-10 platforms

any AR 10 lower