...Courts have fashioned their own definitions of the term. For example, we have previously stated "that where transactions of sale, purchase or exchange of firearms are regularly entered into in expectation of profit, the conduct amounts to engaging in business." United States v. Van Buren, 593 F.2d 125, 126 (9th Cir.1979) (per curiam). In United States v. Wilmoth, 636 F.2d 123 (5th Cir. Unit A 1981), the Fifth Circuit stated that to prove the status of the accused as one engaged in the business of dealing in firearms, "the Government must show a greater degree of activity than the occasional sale of a hobbyist." Id. at 125. "It is enough to prove that the accused has guns on hand or is ready and able to procure them for the purpose of selling them from time to time to such persons as might be accepted as customers." Id.; accord United States v. Carter, 801 F.2d 78, 82 (2d Cir.), cert. denied, --- U.S. ----, 107 S.Ct. 657, 93 L.Ed.2d 712 (1986); United States v. Burgos, 720 F.2d 1520, 1527 n. 8 (11th Cir.1983)....