I've replaced barrels on a lot of handguns but not a Redhawk. I did have Ruger replace a barrel on a stainless steel Super Blackhawk Hunter and the turn around time was very fast. I sent it to Ruger because the original barrel was defective so it didn't cost me anything. Therefore I can't give you any estimate of what it will cost. Revolver barrels are not expensive and they are very easy to replace.
