Chambered in 9mm, this barrel is meant to fit with either the P320 or P250 Compact models. Barrels can be replaced easily and conveniently by simply ensuring the firearm is unloaded, removing the slide from the receiver and grip module, and sliding out the existing barrel. This barrel is threaded and comes with a thread protector cap. Product Specifications Model: P320 Threaded Barrel: Yes Loaded Chamber Indicator: No Caliber: 9mm Luger Barrel Finish: Nitron