Lately I’ve had the best luck with Magpul and OEM mags from the rifle manufacturer itself. Magpul for ARs has been okay across the board, and factory Glock mags are still hard to beat for reliability.
Magpul PMags for any AR pattern and factory Glock magazines for pistols, I don’t bother with anything else. They’ve proven reliable so long that switching feels like fixing a problem that isn’t there.
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