Only a valid passport is needed for coming to Argentina, no VISA is required.
Argentina is friendly about gun importation by hunters, you will be asked to declare your guns upon arrival to Ezeiza International Airport. Rifles, except the fully automatic ones, are legal to import into the country, as well as shotguns and handguns. Gun importation fee is around $ 200 per gun, (US$ 65). You can bring in up to 300 rounds of ammo.
Any .30 caliber is recommended, except for the water buffalo, which requires at least a .375.

You will be hosted at the International Airport by a person of our company to help you through customs and to escort you to the domestic airport.