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Anything unusual about your rifle that could be a culprit? Mods of some kind? ETS is usually pretty reliable, as long as you're using brass.
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I've got 5 ETS mags from when they first came out and they have been perfect in all of my rifles with brass or steel Tula. From 1990-2000 franken rifles/carbines to 1986 to 1990 Colt Hbar A2's and 2005-2011 Colt M4 LEO carbines.
In fact the ETS and pmags are the only ones I use in my franken rifles/carbines now because they hold the rounds a little higher in them which is needed because they unfortunately don't have the m4 feed ramps and rifles/carbines that were pieced together
during the ban era with rifle extensions.
Guess I got lucky. I would have bought more, but I'm not in buying mode anymore at my age and poor, I mean retired.