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The main reason is that MIM parts (which are not inferior) are good to go as they come out of the mould. Investment castings still have to be machined, hardened and finished. But Ruger still makes many of its small parts by machining from the solid, so I wouldn't be surprised to see MIM parts in Rugers before long.
Investment casting, however, can be used for parts that undergo major stress, like receivers and bolts. So far, MIM has not been used for such parts.
Jim
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