This products includes a new in packaging Smith and Wesson M&P Shield 9mm 8rd magazine (PN 3009876) and our MTX Shield +2 extension kit Used together you will have a 10 round magazine for your M&P Shield 1.0 or 2.0. We love this setup for back up or glove box magazines. The extension was optimized perfectly for ergonomics and concealed carry for use with the 7rd magazine, but with a back up magazine more is never a bad thing! 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! Some may call this a 10rd M&P Shield Extended Clip Note: Ships to every state, California compliant!