As far as AR mags goes, I’ve used Pmags, C-Products, Thermolds, Tapco, Palmetto State.
I’ve never had one fail. Poly or metal. I think if your just going to the range, most of them are fine.
Different story if your going to war.
In fact CDNN is having a mag sale now. Super good deal on Thermolds again.
http://www.cdnninvestments.com/specials.html
Thanks for the advice. I bet they will work for my purposes.