In Call of Duty: Black Ops 6, players have the opportunity to unlock several weapon blueprints for free throughout the campaign. These blueprints provide unique designs and enhancements to various weapons, making them more effective in combat. Here's a guide on how to get them without spending real money. First, players can unlock the Onyx Echo blueprint for the sniper rifle LR 7.62 by completing specific missions such as "Hunting Season" and "Cradle". In "Hunting Season", you'll be assisting the SAS in Iraq, while "Cradle" involves infiltrating Saddam Hussein's palace to retrieve weapons. Completing these missions will reward you with blueprints. Another blueprint available is the Truth Serum blueprint for the assault rifle AMES 85. To unlock this, players will need to collect security codes from various campaign missions. There are 9 lockers available, each containing $1000. Once you've collected enough in-game currency ($3000 total), you'll be able to purchase this blueprint at the Weapons Bench. Additionally, the Pocket Aces blueprint for the SMG Jackal PDW and the Bastion blueprint for the Shotgun Marine SP follow a similar unlocking process. Both require players to collect money from lockers and then purchase them at the Weapons Bench for $3000 each. Finally, players can unlock the Case Cracker blueprint, which is a blueprint for a melee weapon (knife). This blueprint is obtained by solving puzzles in a safe house called The Rook in the campaign. Completing these puzzles is simple and can be completed in a few minutes. By following these steps, players can enhance their arsenal without spending real money, making their gaming experience more enjoyable and rewarding.

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