Carbon ring for sure. Has built up enough that its reduced the freebore diameter. Needs a decent scrub with a nylon brush, bigger than bore diameter. If it’s really bad, it may require abrasive on a tight patch.
Carbon ring for sure. Has built up enough that its reduced the freebore diameter. Needs a decent scrub with a nylon brush, bigger than bore diameter. If it’s really bad, it may require abrasive on a tight patch.
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