§ 478.11 Meaning of terms.
http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&rgn=div5&view=text&node=27:3.0.1.2.3&idno=27#27:3.0.1.2.3.2.1.1
Dealer. Any person engaged in the business of selling firearms at wholesale or retail; any person engaged in the business of repairing firearms or of making or fitting special barrels, stocks, or trigger mechanisms to firearms; or any person who is a pawnbroker.
The term shall include any person who engages in such business or occupation on a part-time basis.
Engaged in the business —
(a) Manufacturer of firearms. A person who devotes time, attention, and labor to manufacturing firearms as a regular course of trade or business with the principal objective of livelihood and profit through the sale or distribution of the firearms manufactured;
(b) Manufacturer of ammunition. A person who devotes time, attention, and labor to manufacturing ammunition as a regular course of trade or business with the principal objective of livelihood and profit through the sale or distribution of the ammunition manufactured;
(c)
Dealer in firearms other than a gunsmith or a pawnbroker. A person who 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 the repetitive purchase and resale of firearms, but such a term shall not include 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;