How old guns were made...

https://sadefensejournal.com/the-way-of-the-gun/

https://tribune.com.pk/story/458310/the-legendary-gunsmiths-of-darra-adam-khel

chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.airuniversity.af.edu/Portals/10/ASPJ_French/journals_E/Volume-07_Issue-1/malik_e.pdf

aLL THESE PLACES STILL MAKE GUNS BY HAND, FROM RAILWAY LINE STEEL TO BOILER ROOM PARTS.

You may find this interesting -history of firearms - with Jeremy Clarkson