The use of MIMS parts in low impact areas of a firearm are not an issue.There are literally hundreds if not thousands of pages on MIM quality vs tool steel - which I won’t summarize here. Suffice it to say MIM was adopted by manufacturers as a cost saving move not to improve quality. There is well made MIM and poor MIM, Springfield uses both and which you get depends on your luck.
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Yes, all manufacturing companies look to cut costs. Regardless of popular belief, the hand fitting of a gun, while definitely more expensive, does not mean better quality.
Modern steel processes and CNC machinery make parts much more consistent and precise across the spectrum at a lower cost than hand-fitting could ever do at the rate that they need to turn them out for a price the buying public can reasonably afford.