In my imagination, making pistol frame is probably like making furniture dovetail joint?? It's possible to make dovetail using chisel and hammer, but a template to guide router bit makes the process much easier to follow. But I did not see any templates in the video. Any explanation on that? Purely controlled by hands?
Off topic. Just watched a tank restoration video. Yes, WWII tanks!! Making those big machines running again takes huge amount of effort. Although much bigger, the restoration process in principle is same as gun restoration. They take a few damaged tanks apart, and assemble a working one out. Disassembling a tank is an eye-opening process:
http://www.amazon.com/World-War-II-T.../dp/B0063FL758