IMHO the quality metal Mags are the best choice for a long lasting Mag. if your going to be depending on it to work when needed.
I read the Magpul Mag. lips will weaken when kept fully loaded.

This and the fact Magpul has had the their recalls and they themself have posted they are having quality problems in some production runs.
They might be a good cheap Mag. for range and plinking but as a real defence hardware item I say NO WAY.
