I'm also experimenting with modifying some M&P mags and CZ mags to employ from the carbine. You have to Minimize the notch in the entrance on the mag so it'll lock in. I don't personal any Glocks. For those who had a big pre-current shop of magazines, it would be https://rugersr45forsale35790.blogrelation.com/38270438/ruger-sr45-for-sale-an-overview