I am also experimenting with modifying some M&P mags and CZ mags to make use of while in the carbine. You must cut the notch from the front of your mag so it is going to lock in. I don't own any Glocks.In the event you had a large pre-existing store of Journals, It might be distinctive. I produced an adapter to make use of SIG P320 magazines. Howev… Read More