this post was submitted on 11 Oct 2026
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Sorry, English isn't my first language. I just realised that what I ment by "thread" was actually called "rifling". And, as far as I know, they either use a button broaching or a cold-hammer-forge (CHF) machines. Both not exactly cheap, easy to obtain or easy to operate. An older, much simpler method was to take an octagonal stock pipe and twist it to get the rifling. But this method is way less effective and less reliable. It was also mostly used for revolvers since it's very complicated to machine the chamber directly into the octagonal pipe.
https://youtu.be/gtLYnqZQHCY It's a lot easier than you think it is. Guns are a simple mechanical technology. Any Machinist, mechanic, welder, most carpenters, would have the tools on hand. The barrel blank and springs for mags/recoil management are the hardest parts to manufacture. Which is why most home made firearms are bolt action or slam fire while the more refined ones use blowback operation.
https://archive.org/details/homeexpedientfirearms9mmsmg