I have done a couple of rifles and we do quite a few at the gunshot I work at. It is one of the toughest finishes I have ever seen. One of the rifle we did was a blued winchester 70 action with stainless fluted barrel. The guy who had it done is a guide and intentionally didn't care for it for a month of hunting brown bears in southeast alaska. Even with salt spray and continually being wet there was no rust on the nitrided metal. The scope ring screws were orange and fuzzy
It is an excellent finish for rifles with dual metal, stainless/chrome moly because it comes out a standard black for either. Its fairly spendy, running 350-400 dollars but it is worth it for an all weather rifle.
