My opinion is that MIM parts are used instead of forged or barstock parts because they are cheaper, and some people don't want to buy a product, upon which their life may depend, that has parts chosen because they are cheaper.
The MIM trigger on my new S&W revolver cracked, visibly emanating from up inside the frame, after only some hundreds of rounds. I have a photocopy of the letter I sent to S&W, and the return shipping label that they sent as a result, if anyone wants that minimal level of documentation. It was repaired under warranty.
I have more than a few MIM parts in various 1911s, and have never had any trouble with them.
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