Most mags such as Pro mag and Mecgar usgi are fine
If you are going to be target shooting at the range and not running and
gunning dropping mags. I found once you start serious combat style shootingwhere your doing speed reloads etc the lower end mags wont stack up (pardon the pun)In those cases you should stick with Wilsons and McCormicks.Tougher and more reliable .which is the main criteria for the mags.
I do keep a couple of mags around that I know dont feed reliably and cause
jams regularly I use them specifically when I want to practice malfunction
clearing drills.
regards