Chiappa Firearms X-Caliber Adapter Set 12 Ga 8 Pistol Calibers Black. It was originally designed for smooth bore. 12 GA. The 12 GA Rifle can fire up to 12 different calibers thanks to the 8 steel adapters supplied. In addition to the two original gauges adapters allow you to shoot 8 pistol calibers (.380 9mm .357Mag/.38SP .40S&W .44 Mag .45 ACP .410/.45colt) and two shotgun calibers (410 ga 20ga). It combines the flexibility of a shotgun and the power of a rifled gun. Specifications for Chiappa Firearms 970387 X-Caliber Adapter Set 12 Ga 8 Pistol Calibers Black: Manufacturer: Chiappa Firearms Finish: Black Magazine Capacity: 0 Round Magazine Included: No Gauge: 12 Package Contents: Chiappa Firearms 970387 X-Caliber Adapter Set 12 Ga 8 Pistol Calibers Black The Chiappa Firearms 970387 X-Caliber Adapter Set 12 Ga 8 Pistol Calibers Black is a quality addition to the Chiappa Firearms lineup. For more great deals on Gun Parts by Chiappa Firearms please browse our Chiappa Firearms Gun Parts page. Chiappa Firearms 970387 X-Caliber Adapter Set 12 Ga 8 Pistol Calibers Black