I'm also experimenting with modifying some M&P mags and CZ mags to utilize from the carbine. You have to Reduce the notch while in the front in the mag so it is going to lock in. I don't very own any Glocks. oil on everyhting else. After i shipped mine https://titusrvgpp.weblogco.com/32200397/top-guidelines-of-ruger-p89-for-sale