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The 638 has been swapped with a 642 but these are all from the past 12 months. Love them and they have all performed perfectly. The 638 went back to Smith for a issue and was fixed in a timely manner and returned. I moved it for the 642 as I just like the 42 better. Smith has always answered my questions fully and respected my requests for both repairs and information.
I have no problem with the MIM parts or the lock. For me, if the lock saves on person/child then it is a small price for me to live with. If it ever bothers me enough I can simply remove it, I am competent with a flat ground screwdriver.
Be safe, Frank.