I've noticed several shotguns that have the full auto perk that, surprise, lets them shoot in full auto mode. What's the difference between this perk and the 4th horseman's thunderer perk?
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Full auto pretty much increases the fire rate and i believe stops the pump animation in between each shot. Thunderer is just a faster version by a huge amount, good for burst damage but not practical for ammo conservation. Fun gun to use.