No..a nuke is not concidered ammo..LoL
BTW, US Code prohibits the sell of weapons:
TITLE 42 > CHAPTER 23 > Division A > SUBCHAPTER VIII > Sec. 2122.
Sec. 2122. - Prohibitions governing atomic weapons
It shall be unlawful, except as provided in section 2121 of this title, for any person to transfer or receive in interstate or foreign commerce, manufacture, produce, transfer, acquire, possess, import, or export any atomic weapon. Nothing in this section shall be deemed to modify the provisions of section 2051(a) or 2131 of this title
Whats 2121?
(c) Sale, lease, or loan to other Nations of materials for military applications
The President may authorize the Commission or the Department of Defense, with the assistance of the other, to cooperate with another nation and, notwithstanding the provisions of section 2077, 2092, or 2111 of this title, to transfer by sale, lease, or loan to that nation, in accordance with terms and conditions of a program approved by the President -
(1)
nonnuclear parts of atomic weapons provided that such nation has made substantial progress in the development of atomic weapons, and other nonnuclear parts of atomic weapons systems involving Restricted Data provided that such transfer will not contribute significantly to that nation's atomic weapon design, development, or fabrication capability; for the purpose of improving that nation's state of training and operational readiness;
(2)
utilization facilities for military applications; and
(3)
source, byproduct, or special nuclear material for research on, development of, production of, or use in utilization facilities for military applications; and
(4)
source, byproduct, or special nuclear material for research on, development of, or use in atomic weapons: Provided, however, That the transfer of such material to that nation is necessary to improve its atomic weapon design, development, or fabrication capability: And provided further, That such nation has made substantial progress in the development of atomic weapons,
whenever the President determines that the proposed cooperation and each proposed transfer arrangement for the nonnuclear parts of atomic weapons and atomic weapons systems, utilization facilities or source, byproduct, or special nuclear material will promote and will not constitute an unreasonable risk to the common defense and security, while such other nation is participating with the United States pursuant to an international arrangement by substantial and material contributions to the mutual defense and security: Provided, however, That the cooperation is undertaken pursuant to an agreement entered into in accordance with section 2153 of this title: And provided further, That if an agreement for cooperation arranged pursuant to this subsection provides for transfer of utilization facilities for military applications the Commission, or the Department of Defense with respect to cooperation it has been authorized to undertake, may authorize any person to transfer such utilization facilities for military applications in accordance with the terms and conditions of this subsection and of the agreement for cooperation
Thats it in a non-nutshell...and its not a secret.