A gun license, let alone a portación de arma de fuego license isn't a straight forward procedure here. You need a DNI/legal residency, proof of income, background check, physical medical certificate, a mental health certificate, and for a carry permit specifically you need a Dictamen Jurídico Registral which unlike gun licenses isn't a shall issue but rather a may issue, i.e. you need to convince ANMaC why you need to be able to have a loaded gun in public if you're not a cop/security service member/military member.
American notions of gun ownership do not exist here. That being said, this is about legal gun ownership, there are tons of guns here that are held by people illegally, or people that do things illegally such as having a gun license, but transporting their weapon while loaded/unlocked in public for self defense, which is illegal without a portación license.