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I bought a bunch of the Flex Hones several years ago but they would not ship the oil. I hassled Brownells about it for a substitute nd was told it was just "canola oil" which has worked well for me.
How bad is your chamber? I had a rough .22 chamber that I smoothed very nicely with jeweller's rouge and blue polish on a cotton bore brush, spun on a drill for a few seconds. Clean and check every 30 seconds or so, until you get a mirror finish.