Quote:
I am a trained machinist who has considerable experience fitting parts into
assemblies within .0002 inch that are much more complicated (Ossur's Mauk prosthetic knee), than a 1911.
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And the parts you are starting with are likely made to far higher tolerances than a 1911, even from a high end maker.
These guns were designed when hand fitting was not especially expensive, and precession machining was.