The Pearce PG-42 grip extension enhances control and comfort without sacrificing conceal ability. These units blend with the contours and texture of the handgun to maintain a factory appearance. Made from High Impact Polymer. they withstand drop tests at temperatures from -20 F to 350 F. These units replace the magazine base plate. This extension will not alter the capacity of the magazine. It will add approximately 3/4 inch additional gripping surface..