All of the above gentleman named will do a great job, they will give you the best finish and make the barrels look like they just came from the factory or better. The thing is, if the rest of the gun has it's old finish it will in my opinion not look right.
When I do mine I only make the barrels show the pattern and not bring the full look to them compared to the rest of the gun.
These are WW Greener barrels from 1892

David