Victory!
I finally took out the GB. Kroil, gunzilla, heat, and clamping the barrel in vise and pound the GB with big brass punch and hammer. It finally started moving.
What locked the GB in place wasn't carbon, but some sort of sealant. The white stuff on the journal. That Grendel guy is indeed a lunatic.
The war is over. Time to rebuild. Thank you guys for your help!
-TL
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