tcsd: I believe that your interpretation of that law is incorrect. I just called up the ATF office in Boston and spoke with Ms. Karen Reese. She said that I could ship a handgun to an FFL out of state.
I recommend that you call up your local ATF office and speak with an agent.
Also, I went to the ATF web site and found this:
http://www.atf.treas.gov/firearms/faq/faqb.htm#b1
(B1) To whom may an unlicensed person transfer firearms under the GCA?
A person may sell a firearm to an unlicensed resident of his State, if the buyer is not prohibited by law from receiving or possessing a firearm, or to a licensee in any State.
[18 U.S.C 922(a)(3) and (5), 922(b)(3), 27 CFR 178.29]
also:
(B8) May a nonlicensee ship a firearm through the mail?
A nonlicensee may mail a shotgun or rifle to a resident of his own State or to a licensee in any State. Handguns are not mailable. A common or contract carrier must be used to ship a handgun. A nonlicensee may not transfer a handgun to a non licensed resident of another State.
[18 U.S.C. 922(a)(2)(A) and 922(e), 27 CFR 178.31]
If we take a closer look at the law you quoted:
a)It shall be unlawful
(1) for any person-
(A) except a licensed importer, licensed manufacturer, or licensed dealer, to engage in the business of importing, manufacturing, or dealing in firearms, or in the course of such business to ship, transport, or receive any firearm in interstate or foreign commerce.
The key phrases here are "to engage in the business...or in the course of such business."
Selling a single gun to an FFL is not "engaging in the business...of dealing in firearms." Therefore, sending a single handgun interstate is not "... in the course of such business [i.e., the business of dealing in firearms] to ship ... any firearm in interstate ... commerce."
Again, please call up your local ATF office and tell us what they say.
Jared