Chiappa Firearms 20GA .357 MAG/.38 SPL Colt Caliber Conversion Kit. This small block insert adapter allows you to convert your 20GA/357 / 38 caliber handgun to a 357 magnum and back again. This insert is required to convert the handgun back to standard caliber and function. Conversion of the handgun to a 357 magnum firearm using the correct adapter is essential. The correct adapter may not be the one you need to convert your shotgun to a 357 magnum or larger caliber. Specifications for Chiappa Firearms 20GA .357 MAG/.38 SPL Colt Caliber Conversion Kit: Manufacturer: Chiappa Firearms Color: Black Finish: Blued Fabric/Material: Steel Gun Make: Universal Gun Model: Universal Caliber: .357 Magnum 20 Gauge Magazine Capacity: 1 Round Magazine Included: No Condition Details: Other Condition Quality: Excellent Condition: New Package Contents: Chiappa Firearms 20GA .357 MAG/.38 SPL Colt Caliber Conversion Kit The Chiappa Firearms X-Caliber 20ga/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 20GA .357 MAG/.38 SPL Colt Caliber Conversion Kit is compatible with? The manufacturer suggests that Chiappa Firearms 20GA .357 MAG/.38 SPL Colt Caliber Conversion Kit is compatible with UniversalChiappa Firearms 20GA .357 MAG/.38 SPL Colt Caliber Conversion Kit