I would PREFER to go to a bank where people can't enter with a gun legally! What makes me think you're American?'No guns' rule is not in all banks. Let's say, BanReservas branches in SD have a sign on the doors and in some branches security guards have handheld metal detectors. Banco Popular doesn't say anything about guns, so as soon as nobody can see it, that's OK (but it's a general rule for carrying a gun here, it's must be concealed). That's one of the reasons why I use Banco Popular only and never use BanReservas, why would I use a bank where I can't enter with a gun legally?