Why anyone would want to sink assets into - let alone move to - another country, especially a south american country, ONLY to be able to do what you can already do here relatively inexpensively, is completely beyond me.
For tax reasons, I can understand it. For women reasons (assuming you're a spineless man who prefers women who aren't uppity) I can understand it. For sexual tourism, I can understand it. Just so you can pack a gun and shoot full auto weapons at the end of each day?
If you can afford to feed one anywhere to the point where you'd be regularly using it, you can afford to own one here.
Even if there's a place with better gun laws, I guaruntee it'll not be as pleasant a place to live as the US. Especially SA- you're looking at huge corruption, culture shock..
I suppose it's a decent liquid fantasy.