I am also experimenting with modifying some M&P mags and CZ mags to employ inside the carbine. You should Slash the notch in the entrance of your mag so it'll lock in. I don't very own any Glocks. I just compensated $three hundred for the blue P85 in holster worn https://ruger-sr45-for-sale49466.webbuzzfeed.com/32617782/getting-my-ruger-sr45-for-sale-to-work