While most "exclusive" weapons are locked behind paid DLC, the base game contains several high-tier items that feel like exclusives but only require and In-Game Cash :

: If owned content isn't appearing, ensure the DLC is fully installed through your platform’s manager (Steam, Epic, Xbox, or PlayStation). Unlocking Exclusive Mission Rewards

Let’s address the elephant (or the Great One) in the room immediately: However, there are legal, smart, and cost-effective ways to access every piece of content the game has ever released.