I'm surprised no one's mentioned Switzerland. For those who missed these (likely not Osborn and brien), here are a couple of excellent articles concerning Swiss gun laws and culture with comparisons to ours:
Swiss Gun Laws- and some rebuttal to HCI "spin" US vs. Switzerland Gun Laws
The articles are somewhat dated, but most information is still current and relevant. Two things I find critical and necessary for the US today: change in our society's attitude about guns, and the requirements for training.
I think Switzerland shows that the US was set up the correct way, but that it's since been perverted beyond recognition, making us vulnerable to the tyranny at hand.
Switzerland was not invaded by Hitler; I've heard mention it was due to their armed citizenry. Can anyone confirm this for me?