This magazine grip extension replaces the magazine floor plate providing two extra rounds of 9mm and one round of.40 cal.It also adds 1" additional gripping surface for better control and comfort while also incorporating the factory texture pattern.The extension uses the patent pending pearcelock mechanism to secure the extension body to the magazine.Note: will not work on s&w shield 45 acp, ez frames or s&w shield "plus" frames.Caliber: 9mm LugerCapacity: 2rdFinish: TexturedModel: Magazine ExtensionMaterial: PolymerModel Fit: M&P ShieldBrand Fit: S&WCapacity: 2