IMHO The stippling effect you notice is what I would call "freckling". It is just a form of rust that I would imagine was caused by condensation that occurred in storage. The barrel steel is somewhat different from the rest of the pistol and it was apparently most affected by the moisture since the frame shows no such effect.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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