This unit replaces the magazine base plate on the M&P Shield 45. This extension does not alter the capacity of the magazine. It adds approximately 3/4" inch additional gripping surface. Not for use on extended magazines. FeaturesThese units blend with the contours and texture of the handgun giving a factory appearance.Made from High Impact Polymer and withstand drop tests at temperatures from -20 F to 250 F.They provide comfort by increasing the length of the grip 3/4 inch over stock dimensions.They provide an easier means of manually extracting the magazines.