Before 19 February 2002, foreigners visiting the United States could be a weapon in the U.S. get for hunting and sporting purposes without obtaining a permit from the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), provided they comply with the Customs and Border Protection (CBP) Officers' examination. However, effective 19th February 2002, ATF enforcement of a temporary rule, require foreign visitors to the U.S. on a federal firearms license by ATF received in advance of their arrival is. This temporary rule should be adopted in force until a final settlement. The rule does not prohibit certain foreign visitors, workers and students from the purchase of rifles and ammunition in the U.S. The new rule applies to foreign diplomats called the law enforcement authorities and dignitaries are visiting from the U.S. Department of State.
You must obtain ATF Form 6 NIA from the ATF or by calling (304) 616-4550. They are also required to obtain a license from every state in the U.S. where you are planning to hunt. Also for faster service please fax the approval ATF Form 6 NIA-5330-3D application (304) 616-4554, which takes about 3-4 weeks to get back.