I am also experimenting with modifying some M&P mags and CZ mags to work with from the carbine. You need to Reduce the notch inside the front from the mag so it's going to lock in. I don't own any Glocks. I'd personally use Glock branded Publications instead of the https://felixrtrok.thezenweb.com/a-secret-weapon-for-ruger-sr45-for-sale-70132632