Strike's emp +2 magazine extension increases the capacity of the 9 shield by 2 rounds and the.40 shield by 1 round.The molded design integrates seamlessly with the ergonomics, texture and styling of the m&p shield and conceals well, despite the added length.Caliber: 9mm LugerCapacity: 2Finish: BlackModel: Enhanced Magazine PlateMaterial: PolymerType: Magazine ExtensionModel Fit: M&P ShieldBrand Fit: S&WCapacity: 2