Just to put perspective on this for most of those that might read this, that aren't pro's, or do their own work...
An "average" human hair might be around .003. Now split that hair into 30, even sections.
Now, none of us can machine to that tolerance (tenths) on manual machines- but thousandths, and less- are always in play; and are the difference between a rifle that shoots, and one that doesn't (not to mention safely keeping 60,000+ PSI contained in a one-inch steel cylinder sitting right in front of your eyeballs). It's a big deal.
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