Grip Extension for M&P 9 SHIELD X™ (13 round) This unit replaces the magazine base plate on the M&P 9 SHIELD X™. This extension does not alter the capacity of the magazine. It adds approximately 1/2" inch additional gripping surface. For 13 round magazines only. If you need this extension installed on a factory specific magazine check out the PARTS+MAG section for current availability. NOT FOR EZ FRAMES. NOT FOR ORIGINAL SHIELD "single stack" FRAMES. Key Benefits These 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 1/2 inch over stock dimensions. They provide an easier means of manually extracting the magazines.