In person, I have only seen failures with the older FDE PMAGs.
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I just ordered some OKAY Surefeed. If polymer can age in funny ways perhaps it's best to have some metal magazines too.
I've been happy with Surefeed as well, but they are a no go for some situations. Specifically, no bueno for M855A1 and M16A2/A4, and other lower receivers where there are not M4 feedramps. Beyond that, I find the M3 M3 PMAGs aka Gen 3 PMAGs coupled with Ranger plates to be where it's at. When wearing a helmet and shooting ACOGs for days on end, it takes some strain off your neck.
The issue with the FDE Gen1 PMAGs isn't based on them being polymer. I have plenty of Gen1 PMAGs going strong. Just that the FDE version of the Gen1s were not on par with the strength of the black versions as not all polymers are equal. Magpul continued the development of their polymers and the Gen3s have done very well in in both black and Coyote.
Q. How long can a PMAG stay loaded?
A. Until I can vote 30 times.
I have had several Gen1 OD pmags with cracked feed lips. And they always seem to show themselves during a match never during practice.