Free: Contests & Raffles.
(iv) to a person who is under eighteen years of age for lawful hunting, sporting, or educational purposes while under the direct supervision and control of a responsible adult who is not prohibited from possessing firearms
Find and read I594 that will answer your questions. Section 3Exceptions to gun transfers under subsection (4)Don't trust strangers online to give you legal advice on gun laws.
Buy a gun. Let him use it while he is with you/on the hunting trip with you. No one will care of the silly legality of it. The transfer law that may or may not make that illegal was a badly written law that no one enforces in a hunting situation, and was not the intention of the law. The reason you get conflicting info is because it is all speculation, no one has ever been charged with that type of infraction even though it takes place all the time. Not unsimilar to jay-walking, it may be illegal but no one will enforce it.