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- Embed this notice@admin @GLObalMARinePR @KarlDahl @Ottovonshitpost I also suspect that nobody can tell a MIM part from a machined part, except by morphology: a machined part has imperfections that MIM part does not have. For example, many machined magazine latches on pistols are made from two parts (the stem and the head), so one can see a little circle of a dissimilar metal where stem was welded into the head, then dressed down with mill or a belt sander. But a MIM latch does not have that circle.
Ruger made its reputation as a casting company, and they never were shy of leaving the cast surface untreated where it didn't impede the function of the gun. This is where the kvetching about Ruger guns feeling cheap originates, and it went on before MIM technology became common.
Coincidentally, my Beretta 92X has a cast slide, and Beretta USA didn't think it necessary to clean up its inside. They only machined the outside. The one complaint about it that I heard, unsurprisingly on the hive of the pros that is Pistol-Forum, is how the cast surface of Beratta slides makes it more difficult to see cracks early. They have imperfections at times that cannot be told apart from cracks. I suppose it's the sort of concerns you start to have about the cast parts when you shoot 50,000 rounds a year.