The Ring of Fire is a phrase coined to describe a group of now (mostly) defunct gun manufacturers in California. The original companies were Bryco, Jennings, Lorcin, Raven and Phoenix. They specialized in cheap, poorly made pistols in sub-service (less than 9mm) calibers.
The idea was (ostensibly) to make small, easily concealed pistols that could be sold in the $100-175 price range. They were marketed as “affordable,” but the quality was such that nobody versed in firearms would even consider trusting one for self-defense.