XTech Tactical M&P9 9mm 22 Round Magazine Extender Black 22. Featuring the MTX extension pre-installed it offers superior reliability for duty or tactical applications. It includes a stainless steel extended spring and a low-profile design. Specifications for XTech Tactical M&P9 9mm 22 Round Magazine Extender: Manufacturer: XTech Tactical Gun Model: Smith & Wesson M&P Caliber: 9mm Luger Magazine Capacity: 22 Round Color: Black Features of XTech Tactical M&P9 9mm 22 Round Magazine Extender 22-round Magazine for M&P9 Full Size 9mm Stainless steel extended spring Reduced length vs. factory extended mags Package Contents: XTech Tactical M&P9 9mm 22 Round Magazine Extender What firearm models does the manufacturer say XTech Tactical M&P9 9mm 22 Round Magazine Extender is compatible with? The manufacturer says that XTech Tactical M&P9 9mm 22 Round Magazine Extender is compatible with Smith & Wesson M&PXTech Tactical XTT140-M&P9-EXT-MAG: M&P9 9mm 22 Round Magazine Extender Black 22