I am also experimenting with modifying some M&P mags and CZ mags to implement in the carbine. You must Minimize the notch from the front on the mag so it can lock in. I don't possess any Glocks. Not terrible, but looking at how much manufacturing unit mags are heading https://rugerp89forsale67777.bloggosite.com/38879829/fascination-about-ruger-shotguns