This is kind of an after action report on the 1919A6 barrel that was involved in the accident. The last post on the damage to the 1919A4 due to some Turkish ammo showed a barrel that had a case stuck in it that the base was sheared off.
The first step was to use a broken shell extractor. I have one or two of them
With the neck removed I used my chambering reamer to slowly remove the brass case. After about 20 minutes of running the reamer in then cleaning it I was able to remove the remaining part of the brass case.