Neither one will work well, one will just not work with 3 more rounds. Sorry, thats the best that can be said for USA magazines. They are probably a front organization for Handgun control, figuring if we buy magazines that don't work, they've disabled the gun!
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Dorsai
Personal weapons are what raised mankind out of the mud, and the rifle is the queen of personal weapons. The possession of a good rifle, as well as the skill to use it well, truly makes a man the monarch of all he surveys.
-- Jeff Cooper, The Art of the Rifle