The Ancient Beam Turret is made of Ancient Plastic.
There are 2 types of Ancient Beam Turrets: One just shoots and the other shoots a honing beam which follows the player. Both shots deal 100 damage to the player when hit.
How to get:
If you want to get this for some reason, it can be found on Ancient Drones, Ancient Wind Turbine, Ancient Drone Maker, Ancient Fortress.