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My Norinco 226 has a broken firing pin too. It happened when I was doing some dry firing. Maybe not a coincident. I was trying to get hold of Norinco importer to one from Norinco. No luck yet. Still waiting for it.
Iam almost sure there was an answer to this in the links, listed in the NP22 info thread I've put together.. and it was same as Dsiwy said.
Either way it would be awesome if you post your findings.