Chiappa Firearms 12GA .357 MAG/.38 SPL Caliber Conversion Kit. 7in long rifled on the inside itll let you use 357MAG or 38SPL in a 12GA (only break action shotgun). A lip in the shape secures cartridge extraction so it can be removed easily. Specifications for Chiappa Firearms 12GA .357 MAG/.38 SPL Caliber Conversion Kit: Manufacturer: Chiappa Firearms Color: Black Finish: Blued Fabric/Material: Steel Gun Make: Universal Gun Model: Universal Caliber: .357 Magnum 12 Gauge Magazine Capacity: 1 Round Magazine Included: No Condition: New Package Contents: Chiappa Firearms 12GA .357 MAG/.38 SPL Caliber Conversion Kit The Chiappa Firearms X-Caliber 12ga/357/38 Gauge Adapter Insert 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. What firearm models does the manufacturer say Chiappa Firearms 12GA .357 MAG/.38 SPL Caliber Conversion Kit is compatible with? The manufacturer says that Chiappa Firearms 12GA .357 MAG/.38 SPL Caliber Conversion Kit is compatible with UniversalChiappa Firearms 12GA .357 MAG/.38 SPL Caliber Conversion Kit