I would never really recommend any sand/bead blasting on barrels or any gun parts for that matter. All you will do is be removing the loose/red rust. it will do nothing for the pitting that is present. If restoring the surface properly is what you are going for, hand filing/polishing is the only way to remove the pitting that is there from the rust.
Based on your couple photos, the gun has some good things going for it. And it looks like it needs some work too. Mostly related to the barrel finish.
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B. Dudley
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