Ok I have a Stevens 16 ga. Bouble barrel with hammers and was in need of help restoring, stock in mint, barrel and receiver just has what appears to be minor surface rust. Question I have is how can I re-blue the barrel and receiver? I have been told because it is a different steel it needs a different process for bluing. It is a model 235 and serial numbers A49xxxx. I have shot the gun several times and it shoots very sweet.