I tried them when they first came out with mixed results. They worked great in my JP 13 and Gen 3 Glock 34, but I could not get them to feed correctly in my Gen5 Glock 34s that I was using for Carry Optics. I tried several magazine releases and even one that Adrian at MBX modified as well and they still wouldn't work in my Gen 5 guns. I eventually sold them to some friends for use in their PCC guns and they had no issues at all. I was bummed they didn't work. I have had great luck with MBX mags in numerous different 2011 style guns over the years. I hope you have better luck than I did.