I'm also experimenting with modifying some M&P mags and CZ mags to employ within the carbine. You must Slice the notch while in the front of your mag so it'll lock in. I don't own any Glocks. Not poor, but thinking about how much factory mags are going for at https://dominicktxvso.jaiblogs.com/59186839/ruger-shotguns-things-to-know-before-you-buy