Maintenance is key to about anything mechanical. I've used standard GI mags, H&K mags and Pmags, all whilst in dangerous areas. I remember the black followers, green, yellow and I guess it's orange now. When we got hooked up with the H&K mags, it was a dream come true under burst fire. I carried Pmags on my last trip to Trashcanistan with no issues to report. I have no personal preference, since I have all kinds of mags. I will say GI mags need cleaned to work their best.