Em uma palavra, nenhuma, pois você não seria elegível para comprar uma arma de fogo. Na verdade, a forma federal exigida para comprar uma arma de fogo estabelece a cidadania americana, o número da Previdência Social, etc., e é transmitida eletronicamente para o Federal Bureau of Investigation (FBI) para verificação imediata. Os fornecedores podem nem mostrar uma arma se não acreditarem que você seria elegível para comprar.
A seção relevante do Departamento do Departamento de Justiça dos EUA sobre Regulamentos Federais sobre Armas de Fogo, Armas de Fogo e Explosivos (ATF) (página 215):
[18 U.S.C. 921(a)(33); 27 CFR 478.11]
R. NONIMMIGRANT ALIENS
(R1) Who is a nonimmigrant alien? A nonimmigrant alien is an alien in the United States in a nonimmigrant classification as defined by section 101(a)(15) of the Immigration and Nationality Act (8 U.S.C. 1101(a)(15). Generally, “nonimmigrant aliens” are tourists, students, business travelers, and temporary workers who enter the U.S. for fixed periods of time; they are lawfully admitted aliens who are not lawful permanent residents.[27 CFR 478.11]
(R2) May a nonimmigrant alien who has been admitted to the United States under a nonimmigrant visa possess a firearm or ammunition in the United States? An alien admitted to the United States under a nonimmigrant visa is prohibited from shipping, transporting, receiving, or possessing a firearm or ammunition unless the alien falls within one of the exceptions provided in 18 U.S.C. 922(y) (2), such as: a valid hunting license or permit, admitted for lawful hunting or sporting purposes, certain official representatives of a foreign government, or a foreign law enforcement officer of a friendly foreign government entering the United States on official law enforcement business.