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MIM? Are they trying to be the new Sig?
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Everyone is using MiM these days, it's the way of the future.
MiM is really just a more efficient type of casting and no one ever complained about the strength or quality of good castings (think Ruger, CZ and engine blocks). Like casting, using quality material and good molds along with proper heat treatment and proper parts design are all equally important to achieve the proper strength and quality of the MiM parts being made.
As time goes on, the manufacturers will perfect the art of MiM and these issues won't exist outside of the typical (occasional) Q.C. slip that all companies have. We are stuck in the middle of the manufacturers dealing with the leaning curve involved with MiM on mass production lines, hopefully they will all figure it out soon.
If Mim really bothers you, Glock does not use any Mim parts last I checked. They use sheel metal stampings for most of their parts. Their Extractors, strikers, and polymer parts are old fashioned castings (the slow version of MiM).