I am asking a question I never considered before, and I'm putting it in GSSF because I use the mags to compete in GSSF events. Has anyone ever use G17/34 (or any other caliber for that matter) mags that weren't Glock factory mags? I have these metal mags I got and have not used, because when I ordered them I thought they were Glock mags. They have no brand name on them. Are legal in GSSF events? Has anyone ever used any type of mags other than Glock? I have never used any mags but Glock mags. I appreciate any information I can get. I'm already attempting to return them.