I'm also experimenting with modifying some M&P mags and CZ mags to make use of while in the carbine. You have to Reduce the notch inside the front on the mag so it can lock in. I don't very own any Glocks. I'd personally use Glock branded Publications and never https://ruger-shotguns02333.bloggosite.com/38897935/top-guidelines-of-ruger-p89-for-sale