WHAT IS BLACKNITRIDE?
According to Ben McMillen at H&M Metal Processing in Akron, Ohio, Blacknitride is a chemical finish that was first used on heavy equipment, specifically locomotive cylinders. Later the finish was applied to other things, including golf clubs, and about 20 years ago, they began applying it to firearms receivers and barrels. McMillen called it a “diffusion process.” There is no dimensional change in the metal because the finish doesn’t go “on,’ it goes “in,” he explained. It doesn’t chip or flake, and it penetrates any ferrous metal. “We tell people it’s bluing on steroids,” he chuckled. McMillen said more firearms companies became interested on applying this finish, and although they often called it something else, it was the same process. He estimated that these days, his company does about 80 percent of the Blacknitride applications. Whatever they call it, this Blacknitride seems to be as durable as anything I’ve ever seen, and maybe tougher than many alternative finishes.
Blacknitride is a rugged finish that doesn’t flake or chip because it is in, rather than on, the steel.