A bunch of our guys have been running the Springer Precision mag wells and baseplates. I have one and one of their extention baseplate kits (I think it's a +5). The magwell will also work with the longer 10-8 mag baseplates but not the short ones.
It leaves a small flat lip of the inside portion of the frame and I didn't like that so I used progressively finer grades of sandpaper to blend the frame to the magwell... Depending on what your department's requirements are, this could be prohibited. It is on my department and I only did it because this pistol is for training and fun and not duty use.
The mag extension is retained by a small set screw and I'm not convinced it's a duty-worthy addition, so it's for practice and messing around. Some of our guys use them for competition, but they're prohibited for duty use.
Hope this helps.