I am also experimenting with modifying some M&P mags and CZ mags to utilize while in the carbine. You should Slash the notch within the entrance of your mag so it will lock in. I do not personal any Glocks. In the event you had a sizable pre-current retail store https://ruger-sr45-for-sale49011.ivasdesign.com/53878573/the-smart-trick-of-ruger-shotguns-that-no-one-is-discussing