Frankly I think MIM in a 1911 is a no-brainer and should be fine. The reason this is even a conversation is Kimber. Had Kimber never decided to cheapen out, cut QC and go with the cheapest MIM they could possibly find, we would probably not be having this conversation today - or at least not in this manner. Just about every part of a 1911 could be MIM and work just fine, save extractors, really...something Kimber tried, and then basically screwed over the whole industry with by using poorly done MIM that gave even bad castings a run for their money. Another real problem tied to that one was that Kimber not only used cheap-crap MIM, but charged forged part prices for all their 1911s - even today, a lot of their 1911s are comparable in price to Dan Wessons. Let that one rattle around for a bit...