If the damage is minor, you should be okay. If you really want to upgrade or improve the GP revolver, I'd buy a brand new Ruger barrel; www.e-gunparts.com
& install a new front sight post. New stainless GP barrels may run around $150.00 to $200.00.
I had some minor scuffs & nicks on the GP cylinder of my GPNY revolver in early 2008. I had it slip out while pumping gas late at night while on duty. It hit the cement hard.
I saw a replacement .38spl stainless cylinder on E-gunparts.com .
You could find a local professional gunsmith to install it or go here; www.geminicustoms.com