With all due respect, maybe you'll want to think about this some more before going ahead with nitre blueing on the forearm iron. Certainly the irons on early graded guns were blued... but who's to say it was nitre and not a rust blue? From the standpoint of durablity and corrosion resistance, rust blue is certainly a better choice because it's a chemical reaction (oxide) imparted to the surface. I'm fairly sure the small Fox parts may have been nitre blued but when the factory was rust bluing barrels, why wouldn't they also rust blue the larger parts like the forearm iron? Silvers
