You could have the barrels professionally hot-blued (arsenic and rust are two old-time methods but not for the DIYer), but the cost of doing so may exceed the value of an average Model 24. If you just want a shooter that looks nice, you might try cold rebluing. Cold isn't as long-lasting as hot, but it's cheap and can be effective if done correctly. I have found that the metal in the Model 24 barrels (not the receiver!) accepts cold-blue quite nicely. The cleaner and closer to "white" (bare metal), the better the job seems to work. A very warm barrel reblues better than one at room temperature; I heat them up with an electric heat gun before applying blue solution. I personally like the results of using Oxpho-Blue (liquid, not cream) from Brownell's; I have tried Van's reblue, but it seems a lot more particular. (I have no financial interest in either company.) I'm sure other cold-blue solutions would also work. Bottom line: It depends on how much time and money you want to sink into a gun that's usually worth in the $300 to $400 range.