A high-quality barrel would be hard to wack up at home, but a serviceable one wouldn’t be. In at least one European country I’ve visited, the barrel, lower receiver and bolt all have matching serial numbers stamped on them and are controlled individually as the “gun.” So regardless of the ease or lack of ease of doing it, it’s not unheard of and the three components together sure are a lot harder to throw together with basic machine tools.
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