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Kelly, same deal, I am 99% sure MIM Parts are used Sir. S&W still have MIM parts sentt to their heat treat facility for hardening and in the case of hammers and triggers, case hardening. I would get a definitive answer from Smith and Wesson Customer Service at 1-800-331-0852 Mon-Fri 8:00AM-6:00PM Eastern Time.

Kelly, My 686-6 has MIM trigger and hammer. The gun is warranted for life. Can swap out the trigger to old style case hardened trigger, but not the hammer. S&W MIM parts show no more of a failure rate than case hardened non-MIM parts.