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A quick video on how auto turrets are crafted and how they are used. This includes the range and damage. Additionally I will also show the best placements on your base.
Are they worth it? Well no for PVE (obviously) but even for PVP they have a slow fire rate and don't deal much damage. With that said though they are a good ranged weapon and will probably scare the noob players.
Wiki Page For Auto Turret (Has Needed Materials: http://ark.gamepedia.com/Auto_Turret