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20 MOA base for AR10

Seekins, Nightforce, Badger, Sphur, JP, MPA, all solid options.

The only downside I've seen to the Seekins is if you rail is undersized at all, the rail clamps can bottom out and the mount won't hold. Happened on my last Mega large frame upper build, run them on 2 other Mega uppers without issue, but even on those the clamp is so close to bottoming you almost can't see the gap.
 
I have an American Defense Recon, in 20moa cant. Have had great results with it, and I think AD is a stellar company to do business with.
 
I have used Badger, MPA, Seekins, Spuhr and Vortex without issue. Someone above posted to keep an eye out for undersized rails when using Seekins. I have never seen that but I will certainly look out for it in the future. Vortex would have the same issue.