Thanks so much for the MIM votes, or voting to stop the slander & miss info.
MIM, like any other process can be good or bad, usually depending on the persons or companies that do it. Yes, there have been some failures, but only an inkling of what the net would have folks believing.
Many parts, reasonably high stress parts might be made with the MIM process. GM used MIM connecting rods in some engines. UH, but that's government motors they might use anything. Well, OK if ya think that, but guess what, TOYOTA uses or has used them as well. It's that common.
Getting back to the use of it in guns. Some would argue the original series 70 Colt auto was the best of the best in the day. One of those presented me with more broken parts of any firearm I've owned, and even if MIM had been invented, it wasn't used much at all. Nope, a 1979 Machinery's handbook has no mention of MIM.
Relax, buy good products & hope it pays off. But keep in mind that any manufactured product can & will fail at some point in time.
