THE SMART TRICK OF RUGER SHOTGUNS THAT NO ONE IS DISCUSSING

I am also experimenting with modifying some M&P mags and CZ mags to implement within the carbine. You should Lower the notch within the front in the mag so it can lock in. I do not individual any Glocks.I'd use Glock branded magazines instead of the opposite copies. Some others can be obtained such as Magpul. You could potentially test some and see