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| ||For the perk magazine issue "Whistling in the Dark", see U.S. Covert Operations Manual.|
The weapon was made available as a reward for completing the weekly challenge of "Covert Action" in Survival mode from June 25 to July 1, 2019. The weapon was then made available again from August 20 to August 27, 2019.
The assault rifle is a water cooled, gas operated rifle; featuring a side-mounted magazine firing 5.56mm rounds, anti-aircraft gun style sights, a telescoping wooden stock and charging handle as standard.
This unique legendary weapon does increasing amounts of damage as the night grows longer, but less damage during the day, has +33% VATS hit chance, and +1 Perception.
Whistle in the Dark was a reward for completing the "Covert Action" weekly challenge in Survival mode. The requirements were as follows:
- Kill a creature while using a Stealth Boy
- Destroy a turret while sneaking
- Hack a terminal at night
- Pick a lock at night
- Take a camera picture of a humanlike creature at night