Assuming the stock is not busted and barrel bores not pitted to the point of ruination, there are many competent gunsmiths who can make this gun appear almost as new; but such work is labor intensive hand work, and thus is expensive. You can't just hot blue those barrels like a rifle barrel, they must be slow rust blued; otherwise one can totally ruin the barrels as the solder holding barrel ribs in place can be dissolved by hot blue salt compounds. You didn't post pics; but I suspect freshly blued barrel tubes would be/look really out of place if the other gun finishes were not restored? I suggest you have a double gun professional evaluate the gun to tell you what is needed and approximate cost; otherwise I'd leave the gun as is. But whatever you decide, remember this is a low-grade gun that would never return the cost of its restoration; your return would be in sentimental value, which as we all know can be priceless.