Chambered in .9mm, this barrel is meant to fit with the P320 Compact model. The barrel 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. Type Pistol Model P320 Finish Nitride Length 3.90" Series Replacement Barrel Sights None Caliber Or Gauge 9mm Luger