Pistol Magwells are designed to allow for faster reloading of the semi-auto by giving you a bigger opening that is flared and beveled to guide the magazine home. Is almost like, if you get close enough the magazine will just find its way in on its own. Most can be easily removed, depending on how they were installed.
Just settle for the guarder version, the trigger bars come warped and I had to donate my tm bars and the trigger itself varies. One works fine and the other one is too large. avoid