Need advice on magazine selection for AR 6.5 Grendel

There were some bad instances of feed lip angles on some of the earlier CProducts mags, but I haven't seen any issues in a long time. I have original CProducts, ASC, and CProducts Defense mags that all work fine.

If you come across the straight 17rd CProducts mags, they will not feed more than 7 rounds for me reliably, and AA rejected them on sight because they weren't a curved body mag. Anything over 10 rounds needs a curved body with the Grendel. The 25rd mags work fine, for example.