 Fairly standard in design, with respect to other double action / single action (DA/SA) heavy frame revolvers, the key design difference between the FN Barracuda and other brands is the rapidly interchangeable cylinder, allowing the user to easily switch between 9×19mm Parabellum, .38 Special, and .357 Magnum calibers.The gun has a pinned barrel, five-screwed frame assembly, and an internal coil hammer spring that can be adjusted for trigger pull weight, among other details.The trigger pull for double action configuration, in factory settings, is , and is in single action configuration.