Chiappa Firearms X-Caliber 20ga/357/.38 Gauge Adapter Insert. 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 X-Caliber 20ga/357/.38 Gauge Adapter Insert: Newitem: Yes Type/color: Gauge adapter insert Size/finish: 20ga/357mag/38spl Material: Steel Other features: For use with any break open shotgun recommended extractor 8" fully rifled blued finish Package Contents: Chiappa Firearms X-Caliber 20ga/357/.38 Gauge Adapter Insert 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.