I was looking at all the builds put out, and I haven't seen a single one that uses both rings and guns (though stasis builds are common). I suspect it's because you'd have to sacrifice Willpower to make it work.
My idea was to basically grab all the gun talents and most of the traps, then full magic.
This would allow you to get the aoe capabilities of magic, and while you wait for mana to regenerate, or if you're facing boss/magic resist type enemies, you can use guns/grenades. This removes the weakness of both magic and guns (resource management). It also gives you, in my opinion, the best type of dodge in the game.
I'm still in the beginning of the game, so theory crafting only gets you so far. Has anyone else tried this, or have any input on why this would be a terrible idea?