They certainly didn't have mills as we know them in the 1700s, but lathes, drills, and subtractive manufacturing had been in practice for millenia. You could say they were "machined by hand". Most early firearms (barring large-bore guns like cannons) were made from forged steel or iron, which is significantly stronger than cast iron due to its lower carbon content and regular grain structure. These forged parts were then worked on by gunspiths with cutters and abrasives to produce parts in tolerance for their mechanism. Cast iron (or more typically in early warfare, bronze) was suitable for cannons and large-bore guns due to the mass of the finished gun; more metal meant that the gun could withstand more shock, but even then they could fail catastrophically due to material fatigue or failure.

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notepad0x90 10 hours ago | parent [-]

Well, the kind of guns politicians are afraid people will make at home are not intended for durability. But things like street crime, school shootings,etc.. where it's just a one and done affair.

	▲	shit_game 9 hours ago \| parent [-]
		Complex manufacturing of improvised firearms has been practically made obsolete by the commodification of both steel tubing and cartridges. "Pipe guns" are incredibly easy to make, and require little more than a pipe, a cap, and a drill (which can sometimes be omitted as well). Many common cartridge diameters very closely or exactly match commercially available pipe diameters, and the hardware to make a single-shot firearm is ubiquitous in any store that sells plumbing supplies. Pipe guns are simple and cheap enough to make that some people abuse gun buy-back programs by deliberately manufacturing pipe guns for pennies and pocketing the money these programs offer [0]. These are real, functional guns, and I promise they're simpler, faster, and cheaper to manufacture than any 3d printed gun. 0: https://www.thefirearmblog.com/blog/2014/11/17/handing-zip-g...