I'm also experimenting with modifying some M&P mags and CZ mags to employ while in the carbine. It's important to Slash the notch while in the front of the mag so it will lock in. I don't personal any Glocks. I might use Glock branded Publications and not another copies. https://ruger-sr45-for-sale35566.ka-blogs.com/85476440/the-basic-principles-of-ruger-shotguns