Originally Posted by matt g
MIM parts being problematic is an internet myth. I've got a Kimber with about 12k-15k rounds through it without a hiccup, malfunction or breakage of any components. I've never even thought of replacing them with machined parts.
MIM eliminates residual stressed left over from forging and machining. MIM parts are now being used in aircraft, so they can't be that horrible.
I don't know about myths and I do appreciate the science of MIM and the uses in aerospace etc. I can only confirm that I have personally experienced what I would describe critical breakages on various 1911 pistols over the years. Fortunately they have occurred at the range.
1: Springfield Armory 1911 disconnector
2: Kimber 1911 safety selector
3: (Another) Springfield armory 1911 hammer
Everytime parts were replaced with quality (Wilson, Ed Brown) forged parts and no further problem. Granted, any part can fail but I'll go with experience every time.