Good information already here. I'll add that I prefer aluminum, used to replace the followers with magpul, no need to anymore. You can wear them out and I used to regularly, not so much anymore.
I own many different types but actually have put more rounds thru the mags I've bought from DSG over the years than any others.
I'll add that anyone with any real experience that says there's only one type they trust would be considered of questionable knowledge and experience by me.
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