re: #3 kirkspencer

CNC mills can’t make the barrel, and except for the “jewelry” level tabletops cost near or over 5 figures.

I don’t know why you believe this. People were boring rifle and shotgun barrels on manual lathes and mills long before CNC equipment became available. World War II was fought with firearms built on what would be primitive equipment by today’s standards. You can find used manual and CNC equipment up to the task on the used market for pretty cheap. Grizzly sells new lathes and mills up to basic gunsmithing tasks beginning at just a couple thousand dollars.