Thanks to all. I have managed to remove the remnants to the solder with the careful use of emery cloth after taping up and protecting the non soldered parts of the barrel to protect them. Applied permablue to the metal and managed to get an ok result. not great, but it's on the underside of the barrel and not at all visible when the barrel is in the stock and hand guards are removed. Not really a fan of permablue, but it is what I had on hand. Is there better type of blue that could be used so there isn't that blueish/greenish tinge and shine the the metal when finished.Information
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