Magazines for the 6.8/224Valkyrie. Which to choose?

[Huckleberry75]

I have a buddy that just picked up a .224Val, and does not like the 25rd mag that came with it. He is looking for a couple 10rd mags and wanted to know who to look at and who to avoid. Thought I would pose the query to the Horde.

What say ye?
Thx in advance.