California Code, Penal Code - PEN § 17340

(a) As used in this part, “wholesaler” means any person who is licensed as a dealer pursuant to Chapter 44 (commencing with Section 921) of Title 18 of the United States Code and the regulations issued pursuant thereto, who sells, transfers, or assigns firearms, or parts of firearms, to persons who are licensed as manufacturers, importers, or gunsmiths pursuant to Chapter 44 (commencing with Section 921) of Title 18 of the United States Code, or persons licensed pursuant to Sections 26700 to 26915, inclusive, and includes persons who receive finished parts of firearms and assemble them into completed or partially completed firearms in furtherance of that purpose.

(b) “Wholesaler” shall not include a manufacturer, importer, or gunsmith who is licensed to engage in those activities pursuant to Chapter 44 (commencing with Section 921) of Title 18 of the United States Code or a person licensed pursuant to Sections 26700 to 26915, inclusive, and the regulations issued pursuant thereto.  A wholesaler also does not include a person dealing exclusively in grips, stocks, and other parts of firearms that are not frames or receivers thereof.