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Doctors Medicines MCQs Q&A

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You can use any bluing solution, as long as you make sure not to get any on the inside of the barrel. If you are planning to hot blue it, you should plug the ends of the barrel so that no solution can get inside. You can also cold blue it, using Birchwood Casey Super Blue or Perma Blue. This won't offer as much protection, but it does require less equipment and ensures that none gets inside the barrel.

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