The old gauge 12 gauge chamber and pitted barrel bored out a bit for 18 inches
Then a THIN WALL insert is fabricated and placed in the barrel to give a new
20 gauge chamber, forcing cone and leade configurations.

https://chiappafirearms.com/product.php?id=565

The extractor must be modified to 20 gauge

Last edited by skeettx; 08/08/23 10:02 PM.

USAF RET 1971-95 [Linked Image from jpgbox.com]