The weapons were not legally stored, police said in a social media post, which described the ghost gun as "not in compliance with California rifle laws."
The post included photos of the confiscated weapons, including handguns, gun magazines, rifles, a shotgun, ammunition, a machete and a hunting knife.
The statement noted that the California penal code "restricts narcotics addicts, convicted felons, or persons with active felony warrants from owning, purchasing, or possessing firearms."
The identity of the suspect was not released.