The guys at AMNB have been checking out the Recover Tactical 20/20 Stabilizer Kit for Glocks:
Let’s get one thing straight. Creating a carbine kit for a handgun that renovates the design and function to compare to a personal defence weapon or submachine pistol is difficult at the very least. Handguns are usually not designed to be converted in such a manner without forethought. This means that when a company designs a kit to bring it closer to a carbine or similar, their are compromises that have to be made in order to make it work.
AMNB