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I have been shooting ar's since the late 80's (before they were cool). I have always used Colt, Armalite or LEO branded metal mags (various manufactures) and I have never had a problem.
The first plastic mag I tried was a pmag and it would not lock into the mag well on 1 ar, the other 3 it would. I never warmed up to plastic so was the justification to not own any. I sell them or trade them for metal.