I recall reading some time ago that S&W's MIM parts were case hard, meaning only the outer surface was hard, something like .010" thick. However, I read that on the internet and you know how that goes. Personally, I wouldn't want the parts hardened all the way through. A part that is case hardened can absorb shock better than one hardened completely. Those tend to break instead.

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So many S&W's, so few funds!!