Do a search and you should find several quite thorough discussions on the subject.
Very Short Version - it depends on what part is MIM. A grip safety? Absolutely no problem. A sear? Mmm, will probably outlive you, but the trigger pull may eventually change. A slide stop? Some have posted pics of them having strange chip-like marks, but I can't recall someone saying they broke one...
Don't worry - I think when you read on the topic you will be put at ease...
Too many people miss the silver lining because they're expecting gold.
M. Setter
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