The Full-Size M&P9 and M&P9 2.0 +5 Magazine Extension is compatible with factory magazines and installs in seconds. Unlike other extenders on the market, The Patented design of the MTX includes our leading edge that goes up into the magazine, eliminating any catch point and enabling flawless feeding! If you are looking for factory reliability there is no alternative to the MTX for a M&P 2.0 mag extension. Our design also requires no tools to install, ships with an engineered extended stainless spring and passes dozens of drops without issue. Our included spring was engineered specifically for the M&P9 line to allow for unmatched reliability and last round hold open. XTech Tactical's MTX line of extenders are simply unmatched for reliability, ease of installation, and durability! Note: WILL NOT SHIP TO CA, Cook County IL, MD, MA, NJ, NY, VT, DC, CT, HI, WA or INTERNATIONAL.