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In order to re nickle this old 20 gage shotgun bolt I had to disassemble it. All went well until I got to removing the firing pin. The shotgun is an H&R Model 121. The firing pin spring has a retainer hidden inside a cap. Very difficult to wirk with. I fabricated a spring compressor to expose the retainer for removal. That retainer is a trick to remove. But it's done. Wheuww!