Save a turret from redemption
During Chapter 5, you will be heading to the turret control room. Along the way, you will come to a conveyor belt that has bits and bobs on it. Look for the laser of a turret that is on the belt and pick it up as you move your way along. When you pick it up, it will thank you and you will get the reward. Then you can promptly chuck the turret aside and continue on.

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