For the purpose of this chapter, unless the context requires a different meaning: “Dealer in firearms” means (i) any person, firm, partnership, or corporation engaged in the business of selling, trading or transferring firearms at wholesale or retail; (ii) any person, firm, partnership, or corporation engaged in the business of making or fitting special barrels, stocks, or trigger mechanisms to firearms; or (iii) any natural person that is a pawnbroker. “Engaged in business” means as applied to a dealer in firearms a person, firm, partnership, or corporation that devotes time, attention, and labor to dealing in firearms as a regular course of trade or business with the principal objective of livelihood and profit through repetitive purchase or resale of firearms, but such term shall not involve a person who makes occasional sales, exchanges, or purchases of firearms for the enhancement of a personal collection or for a hobby, or who sells all or part of his personal collection of firearms. “Firearms show” means any gathering or exhibition, open to the public, not occurring on the permanent premises of a dealer in firearms, conducted principally for the purposes of exchanging, selling or trading firearms as defined in § 18.2-308.2:2.