An Investigation by NBC Bay Area in partnership with NBC San Diego, NBC Los Angeles, and the non-profit journalists at The Trace found that law enforcement agencies across California are recovering record numbers of ghost guns. According to several ATF sources, 30 percent of all guns now recovered by agents in communities throughout California are homemade, un-serialized firearms, known on the street as “ghost guns.”
Guns have been made at home and in small shops for the entire history of the USA. From criminaldefeselawyer.com:
Individuals in this country have been making their own guns for centuries. The practice is deeply rooted in our constitutional history and tradition. Legal scholars have recognized that the Second Amendment’s guarantee of the right to keep and bear arms would be meaningless in practice unless the state afforded individuals the ability to exercise that right—which includes making their own guns.