Up until the recent change, S&W always made hammers and triggers of unhardened carbon steel and case hardened them. Many people messed them up by stoning and cutting through the case hardening. I understand they are now using a new technique as Gary describes. In fact, I thought Ruger was also using that and has been for some time. I know their parts are harder than heck and don't seem to be just hardened steel.
Jim
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