Modern Warfare 3 and Warzone Season 4 update is here, giving a special chance to the players to unlock the World Ender blueprint for free.

Made for the FR 5.56 assault rifle, this weapon skin predominantly features a bright and glowing green color with darker green accents, giving it a futuristic look.

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If you also want to add this cosmetic to your collection, here’s everything you need to know about unlocking the FR 5.56 World Ender blueprint.

How to unlock the free World Ender blueprint in MW3 and Warzone

The World Ender blueprint for the FR 5.56 weapon can be unlocked for free by completing all the challenges of the Critical Countdown event.

Critical Countdown event rewards in Modern Warfare 3
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The event was introduced as a part of the Modern Warfare 3 and Warzone Season 4 update, in which players are tasked with collecting four different types of DNA Strands.

These strands can be obtained by killing enemies in MW3 Multiplayer, Zombies, and Warzone. As of writing, only two of the four mastery challenges are available in the game.

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Below, you can find the complete list of available mastery challenges you must complete to unlock the World Ender blueprint.

All Critical Countdown event challenges

Once you collect sufficient DNA Strands and unlock the rewards below, the FR 5.56 World Ender Blueprint will automatically be added to your Call of Duty account.

Ade (Mastery Challenge 1)

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  • Double XP Token – 390 DNA samples
  • Double Weapon XP Token – 780 DNA samples
  • Double Battle Pass XP Token – 1,560 DNA samples
  • Double XP Token – 3,125 DNA samples
  • Double Weapon XP Token – 6,250 DNA samples
  • Double Battle Pass XP Token – 12,500 DNA samples

Cyto (Mastery Challenge 2)

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  • Security Clearance Calling Card – 1,560 DNA samples
  • Safety First Emblem – 3,125 DNA samples
  • Just a Spill Sticker – 6,250 DNA samples
  • Double Battle Pass XP Token – 12,500 DNA samples

TBA (Mastery Challenge 3)

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  • Mission Debrief – 2,340 DNA samples
  • Double Weapon XP Token – 4,675 DNA samples
  • Battle Pass Tier Skip Token – 9,350 DNA samples

TBA (Mastery Challenge 4)

  • Double XP Token – 3,125 DNA samples
  • Exerting Control – 6,250 DNA samples

It’s important to note that the Critical Countdown is a four-week-long event, so make sure to complete all the challenges before the event ends.

READ MORE: How to get JAK Harbinger Kit in Modern Warfare 3 and Warzone