This unit replaces the magazine base plate on the Springfield XDS/XDE/XDSMOD2 in 45ACP, 40 S&W and 9mm single stack magazines. This extension does not alter the capacity of the magazine. It adds approximately 3/4 inch additional gripping surface. Features: These units blend with the contours of the handgun and have a factory appearance They are made from high impact polymer and withstand drop tests at temperatures from -20 to 350 deg F They provide control and comfort without sacrificing conceal ability