Call of Duty: Warzone receives a whole bunch of content with Modern Warfare 4's Season 1 update, including the arrival of the Hajin and Zodiac maps. Players jumping in also have the chance to unlock new camos, Blueprints, and more completely for free. This includes an exclusive Blueprint for the Signal 50, which can be unlocked through a secret challenge. Here's how to get the Unserialized Blueprint in Call of Duty: Warzone.

The Season 1 update for Modern Warfare 4 has released new Warzone Mastery Camos and more. Here is our updated guide to every camo challenge in MW4.

While you can ultimately skip this step, the hint for unlocking the Unserialized Sniper Blueprint can be found in a note inside a small building just south of the Depot POI on the Zodiac Resurgence map. If you interact with and read the note, it will say the following: "There are Weapon Trade Stations around to exchange guns for a stronger model. Show you can keep up with the arms race by making 25 trade-ins."

If you follow the note closely, it should give you all the instructions needed to unlock this secret reward.

As the note describes, to unlock the Unserialized Blueprint for free, you will need to trade 25 weapons at Weapon Trade Stations. These can be found all around each Resurgence map, meaning you are not limited to Zodiac to complete the challenge. Their locations are marked on both your mini-map and tac map.

Weapon Trade Stations allow you to swap your currently equipped weapon for one of a potentially higher rarity.

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