I'm also experimenting with modifying some M&P mags and CZ mags to employ in the carbine. You must Minimize the notch from the front from the mag so it's going to lock in. I don't individual any Glocks. I just paid out $300 for any blue P85 in holster worn https://rugersr45forsale91111.blogdun.com/32764282/top-guidelines-of-ruger-p89-for-sale