Chiappa X-Caliber 20 Gauge to .357 Mag/.38 Special Adapter Insert

The Chiappa X-Caliber Gauge Adapter Insert (brand part no. 710404) lets a 20 gauge break-open shotgun chamber and fire both .357 Magnum and .38 Special ammunition, giving a single break-action gun genuine multi-caliber flexibility. Chiappa machines the insert from blued steel with a fully rifled 9-inch bore, which stabilizes the pistol-caliber bullet for real accuracy rather than the tumbling pattern a smoothbore insert produces. It’s built for use with any break-open shotgun and pairs best with a manual extractor recommended for this style of insert. Loading is straightforward: drop the insert into the chamber, close the action, and the shotgun is ready to fire either revolver cartridge.

Key Specifications

• Adapts a 20 gauge break-open shotgun to fire .357 Magnum and .38 Special ammunition.
• Measures 9 inches long for a genuine rifled-barrel insert.
• Bore is fully rifled, stabilizing the bullet rather than letting it tumble.
• Machined from blued steel for durability and a traditional finish.
• Fits any break-open shotgun.
• Uses manual extraction rather than an automatic ejector.

Frequently Asked Questions

Does this fire both .357 Magnum and .38 Special? Yes, both cartridges are supported by this insert.

What shotguns does this fit? Any break-open 20 gauge shotgun; a manual extractor is recommended for this style of insert.

Does this insert stabilize the bullet? Yes, the 9-inch bore is fully rifled rather than smooth.

Find more shotgun adapters and parts in our other shotgun accessories & parts category from Chiappa Firearms.

Buy the Chiappa X-Caliber 20 Gauge to .357 Mag/.38 Special Adapter Insert

Being able to run common revolver calibers through a 20 gauge break-action makes this insert a practical addition to any small-game or utility gun. Order it from our Lubbock, Texas gun shop for fast, direct shipping.