What does this mean?
As you may be aware, Section 121 of Public Law 105-277, the Omnibus Appropriations Act for 1999, amended the Gun Control Act of 1968 to prohibit, with certain exceptions, the transfer to and possession of firearms by aliens admitted to the United States under a nonimmigrant visa. This definition includes, in large part, persons traveling temporarily in the United States for business or pleasure, persons studying in the United States who maintain a residence abroad, and certain foreign workers. Therefore, you, as a Federal firearms licensee, are prohibited from transferring firearms to aliens that fall within this category.
http://www.atf.gov/firearms/bradylaw/alien.htm
However, there are certain exceptions to this general rule. The prohibitions do not apply if the alien is:
(A) admitted to the United States for lawful hunting or sporting purposes or is in possession of a hunting license or permit lawfully issued in the United States;