You might think of leaving your gun home and renting a gun at the Estancia you are staying at. I just got home from Cordoba(Cordoba/Panama City/Houston, via COPA and United)and the entire group of us rented guns there.
All of the group but my self and my son had been to Argentina many times and all had given up on the hassles of taking their own guns. We used Beretta 20 ga. autos and they worked flawlessly.
As a side note, these guns get retired every 4-5 years, after having 4-500,000 rounds fired through them.
Just a thought.