I'm also experimenting with modifying some M&P mags and CZ mags to make use of while in the carbine. You have to cut the notch within the entrance of the mag so it is going to lock in. I don't personal any Glocks. oil on everyhting else. After i delivered https://ruger-shotguns79011.blogerus.com/54510446/considerations-to-know-about-ruger-p89-for-sale