I'm ordering a very expensive gun, and the smith is very big on Nitrocarbing it. He says that'll take the metal up to about 60 rockwell for hardness and has no possible issues. I would really like an NP3+ finish, but I hate that silver yellow finish it has. I want a black gun. Is this really the best option? It's a carry gun, and the self lubrication is very important, but Black T wears too easily for this application.