Since getting back to 1911's and getting my Ronin I have been looking at older conversations and seeing a lot of back and forth about MIM parts. Kimber's bad because of all the MIM, ditto for RI, Springfield, Colt, Ruger. MIM, when done correctly, makes a good part. It has been used in aerospace for decades, S&W changed to MIM for their hammers and triggers some time back with a few early issues but refined until they require less fitting and are holding up well ( Not as pretty as the old forged, machined case hardened one though) Colt has used MIM even longer then S&W. If S&W, Colt etc trusts MIM for high stress parts like the hammer and trigger I think I'll trust it for parts on my Springfield. I have looked at my Ronin's Slide stop, Hammer, Grip safety etc and I have no complaints. Besides; if a part breaks I have a life time warranty.