Is it just some form of locktite ?
Can it be removed with gentle heat ?
Just received a barrel where the chamber looks like it was cut with a steam shovel.
Deep grooves and galling about half way down the chamber and it is causing feed/extraction malfunctions.
Unfortunatly for the owner, it is out of warranty.
Could try re-ream and then polish but I think it will need to be changed.
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