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The only AR magazine I have every had fail was an aluminum mag that split along the spine causing a double feed. I've run over 15k rounds through various P-Mags and have never had an issue with them. If running drills on concrete or asphalt, dropping metal AR mags is a good way to smash or distort a feed lip. P-mags will take that kind of abuse and keep right on running. If a P-mag feedlip is damaged enough to not hold the round or cause a malfunction it will absolutely be noticeable (cracked, chipped, etc), and with metal mags, a bent feedlip may or may not be readily apparent.

A-R wrote:Also, for storing mags loaded, I like the little dust cover that comes with most of the P-Mags - helps relieve pressure on the feed lips.

Great advice.

Promag is junk and P-Mags are awesone. I have also had good luck with Lancers. USGI mags with Magpul guts are also a good choice. With the current price of P-Mags, it would be hard for me to buy anything else.