If the gun shoots fine and the brass is undanaged, leave it alone.
We made polishing sticks out of 01 round stock. After filing one end flat (held against a machinust square), We brazed a brass dome on it. We then sawed a one inch slot down the center. Voila, polishing stick. We turned our barrels on the lathe and inserted the stick with a 1" emery strip wrapped around it.
Vigilantibus et non dormientibus jura subveniunt. Molon Labe!