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More than likely the bolt is from a Kokura rifle or carbine. The extractor on those were matched with the assembly number and the rest of the bolt by the serial number. It's probably just a coincidence that they match. Is the prefix the same? The prefix is a part of the assembly number too.One thing does puzzle me, though, in that it all matches to the serial or assembly number, except for the bolt body, firing pin and safety (which match each other), but the extractor matches the assembly number. Maybe somebody in the past tried to find matching number parts and could only find the extractor.