Pachmayr Grip Extenders adapt full-size magazines for use with compact handguns in many popular models. Grip Extenders allow you greater shooting capability by increasing the gun s grip size and capacity with additional rounds. Carry your compact pistol with a standard magazine when concealment is important or insert a high capacity magazine fitted with your Pachmayr Grip Extender when the situation calls for it. The grip extenders simply slide over the magazine and fit securely in place. Specifications: - Fits: Springfield Sub Compact XD9/XD40 with XD9/XD40 Mags