I'm also experimenting with modifying some M&P mags and CZ mags to use within the carbine. You will need to Slice the notch during the entrance on the mag so it can lock in. I don't very own any Glocks. oil on everyhting else. Once i shipped mine to Ruger https://josuefjigh.develop-blog.com/38783689/the-2-minute-rule-for-ruger-p89-for-sale