I think there are two things here, one is colour case Harding and the other is nitride , on 4140 steel it hardens just the surface of the parts. This is what I had done to my Sharps action and breech...
Type: Posts; User: homebrew.357
I think there are two things here, one is colour case Harding and the other is nitride , on 4140 steel it hardens just the surface of the parts. This is what I had done to my Sharps action and breech...