I'm also experimenting with modifying some M&P mags and CZ mags to use within the carbine. It's important to cut the notch within the entrance of the mag so it'll lock in. I do not have any Glocks. Not poor, but thinking about simply how much factory mags are going https://rugersr45forsale57788.fitnell.com/72926780/top-ruger-sr45-for-sale-secrets