Rust, hot, or cold blued frame= no problem.
Rust or cold blued barrels= no problem.
Hot blued barrels= potentially big problems. The soft solder will be dissolved by the bluing salts; it even continues over time even if there appears to be no problems now. Hot blued barrels will usually appear very shiny and bright just like a blued pistol.
Ribs usually need to be stripped and relaid then the barrels reblued. Can't say always though. But if the hot bluing salts got inside the ribs, there is usually no way to stop it. If the barrels and ribs were tight and nothing got inside, they may survive as the salts outside could be neutralized. If it got inside the solder will turn to powder.
Just my opinion and having bought one like that before.
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