Warne Handgun Magazine Extensions are available in both increased capacity models and zero capacity models for 10 round capacity limits.These extensions feature an ergonomic shape that allows for better insertion and finger grooves allowing the magazine to be stripped from the handgun if needed.FeaturesCaliber: 9mm LugerCapacity: 5rdFinish: Hardcoat AnodizedModel: Magazine ExtensionMaterial: 6061-T6 AluminumModel Fit: Sig Sauer P320