Never Fired, New Grips Caliber: 10mm / .40S&W Features: dovetail sights, fires using moon clips, included, see photos. The GP100 is a double-action revolver built around a solid frame and a robust cylinder assembly. Its design emphasizes durability, dependable mechanical operation, and a grip shape that helps manage recoil. The Wiley Clapp-style configuration is known for a more streamlined, practical approach than a traditional target revolver: Compact proportions: Shorter-barrel configurations are easier to carry and maneuver than long-barrel sporting revolvers. Practical sights: High-visibility front-sight designs make the sight easier to distinguish against varied backgrounds. Ergonomic grip: The grip profile is intended to provide a secure hold while maintaining a relatively compact overall shape. Stainless-steel construction: Many GP100 models use stainless steel, offering corrosion resistance and a durable exterior. Double-action/single-action trigger: The revolver can be fired with a longer double-action trigger pull or a lighter, shorter single-action pull after the hammer is cocked, where the particular model supports that operation.