I am also experimenting with modifying some M&P mags and CZ mags to work with during the carbine. You should Reduce the notch from the front in the mag so it will eventually lock in. I don't have any Glocks. Not undesirable, but considering exactly how much factory mags are https://rugershotguns34522.tblogz.com/ruger-sr45-for-sale-an-overview-45981039