I have owned at least two or three (bad memory) Brownings with so called "silver nitride" finishes. The first couple had what probably was something akin to true silver nitride. The latest one is a B525 which is definitely a stainless steel reciever, forend iron, and triggerguard. The barrel hood or shrowd that fairs the barrels to the top of the reciever, is, of course, of the same low alloy (chromoly) steel that the barrel monoblock is made of (yes it's a monoblocked gun). This hood is treated with some process (silver nitride maybe?) to make it silver, but it doesn't match the reciever.
