Before investing any money in it, I would want to make sure that it shoots whatever loads you plan on shooting through it. Check the throats, 29s routinely had .432 throats, so you might have to work up some loads for it, or shoot jacketed bullets.
If I were refinishing a working gun, I would go with the industrial hard chrome finish. I might even finish the internal parts for corrosion resistance.

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Richard Gillespie
FBINA 102