I am also experimenting with modifying some M&P mags and CZ mags to implement during the carbine. You must Minimize the notch from the entrance of your mag so it'll lock in. I do not have any Glocks. Not poor, but thinking about the amount of manufacturing facility mags are https://simonfzdde.answerblogs.com/32331069/ruger-sr45-for-sale-an-overview