This is our favorite EDC set up for the M&P Shield 9mm! The length of the magazine gives you a full grip and the ergonomics are a dramatic enhancement over other set ups. The XTech Magazine Extender/Grip Extender is the best upgrade you can do with the Shield and Shield 2.0. Now you can get our extender already combined with the magazine. Unlike other shield mag extensions on the market, our Patented design permits for a consistent internal wall throughout the extender, which is smaller than the M&P magazine tube. The included spring was engineered specifically for the M&P Shield 9mm to allow for unmatched reliability and last round slide hold open. XTech Tactical's MTX line of extenders are simply unmatched for reliability, ease of installation, and durability! Note: Ships to every state, California compliant!