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There was a real reason for being hand-fitted - because they could not replicate the same parts over and over and over again.
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That is a prize winning observation.
Materials have certainly improved but the real key is being able to produce part after part with a "build to nominal" mindset that results in parts assembling with minimum hand fitting.
The key is to have a process in control and understand the bandwidth of the process as it relates to part assembly and interchangeability.
When I was a teenager, the hot rodders called it "blue printing" an engine. Building to nominal and reducing variation yielded engines that ran smoother and delivered more horsepower with less wear and tear. The same concept allows manufacturers to build guns with easily obtainable replacement parts the user can install without handfitting. The system isn't perfect, but it is improving.