On this video, World of Guns's purpose is only to be a guide for the wiki and show the process, not fastest times. The simplest way I could think of to show it and be uniform on all guns was to use hints. 

World of Guns: Gun Disassembly lets you delve into the inner workings of guns from the largest gears to the smallest screws.

Source: 

World of Guns: Gun Disassembly (Youtube)

WW2 Timeline: 

Nation in war: 

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