The Chiappa Firearms CHIAPPA X-CALIBER 12GA/9MM offers a versatile gauge adapter insert designed for break-open shotguns, blending precision steel construction with an 8" fully rifled barrel to pair a 12 gauge platform with a 9mm chamber. This capable adapter insert is built to work with any break-open configuration and relies on manual extraction to deliver reliable cycling and consistent performance in field or range settings. Engineered from durable steel and finished with a blueed surface, the X-Caliber maintains rigidity and durability under recoil while providing a clean, streamlined profile that integrates smoothly with compatible barrels and receivers. The 12ga/9mm designation highlights its dual-caliber usefulness, enabling shooters to leverage common 12 gauge shells alongside compact 9mm rounds for controlled training, pest control, or specialty shooting applications where space, weight, and versatility matter most. With its compact, 1.80 x 1.80 x 9.05 dimensions and practical gauge adapter insert design, this piece supports dependable manual extraction and straightforward maintenance, making it a practical choice for reloaders, tactical enthusiasts, and precision shooters seeking expanded shooting options from their break-open platform.