Well, you are asking me to concretely say, over the internet and without having the gun in hand, if 100% certain the barrels are hot blued. I cannot and will not do that. I will say that based on what I see, from the photos you show, the barrels were more than likely Hot blued. The lugs are not the only clue. But it is a good one.
If you want a definitive answer, then Get the gun to someone who knows what Hot bluing is Vs. Rust bluing and the appearance of both, let them see it in person and have them tell you.
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B. Dudley
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