I agree with Doug that you should have them both in place when you anneal and re-case the action. The outer pin you can always anneal and nitre if you dont like the cased look. The actual hinge pin is somewhat of a debate. I like to think most of them are made of the same steel as the action and will case harden just fine. This gives you a good treated wear surface for the barrel hook to ride on, as long as its not overly hardened compared to the barrel hook. I know some people dont case them or anneal them afterwards to a similar hardness as the barrel hook. Might not be a bad idea for you should check the hardness before annealing and see if its already soft like the barrel or if its got a file hard skin to it.
