Licensed to Kill and others. I believe that about 1/4 to 3/8 inch of the worm broke off in the plug chamber. I think the plug chamber, if that is the right word, is about .200 inch diameter. The outside diameter of the stuck threaded piece is about .205 inch. It has been suggested that maybe a piloted end mill with a long shank could be used to remove the offending piece. That does seem safter than removing the breech plug. The barrel length is about 33 1/2 inches from the muzzle to the joint of the plug/barrels. A single barrel gun would present fewer problems than this double.
Here is the piece that broke off in the breech.
![[Linked Image from i.imgur.com]](https://i.imgur.com/vda23YD.jpg)
![[Linked Image from i.imgur.com]](https://i.imgur.com/ZdmubPD.jpg)
![[Linked Image from i.imgur.com]](https://i.imgur.com/QoIzJGp.jpg)