I dealt with Magpul over some issues I had with a few AR Pmags and they were a pleasure to deal with. I contacted them about the Glock Pmags a few years ago when I first noticed issues and was told I needed to lightly lubricate the inside of the mag bodies. I tried that and it did not fix the issues. I just relegated all my Glock Pmags to range use only and never tried getting back in touch with Magpul.