One of the undisputed best choices of secondary weaponry in Warzone 2.0 is the Kastov-74u, an Assault Rifle that is easy to use and offers superior stats. Its primary role is to be the second firearm for combatants with loadouts using the Overkill Perk, such as Sniper or Shotgun users. Of course, there is no issue with Kastov-74u being used as a primary weapon, but its high Mobility, Handling, and Damage make it an excellent backup firearm to surprise enemies in a gunfight. The Kastov-74u can cut through enemies like a hot knife through butter at close to medium ranges, making it one of the greatest support weapons for specialized Overkill loadouts.
Best Class Setup for Kastov-74u in Warzone 2.0
Kastov-74u users in Warzone 2.0 are encouraged to use Perks that offer some defense and agility for combat. For instance, Battle Hardened is helpful for resisting CC effects, and Fast Hands is beneficial for swapping primary and secondary firearms. As mentioned above, Overkill is mandatory for builds that use Kastov-74u as a support firearm.
Warzone 2: Best Kastov 545 Loadout and Attachments
For equipment, Drill Charges are good for clearing enemies out of enclosed spaces to prevent ambushing, and Stims can be used to restore HP and have some extra stamina when moving between vantage points. Next, YouTuber IsaacAndersn has compiled an excellent selection of attachments for the Kastov-74u in Warzone 2.0 that slightly improve its stats while minimizing any negative impairments to its kit:
Increases: Vertical Recoil Control and Horizontal Recoil Control
Decreases: Aim Down Sight Speed and Aiming Stability
Increases: Bullet Velocity
Decreases: Damage Range
Increases: Magazine Ammo Capacity
Decreases: Aim Down Sight Speed, Movement Speed, Sprint to Fire Speed, and Reload Quickness
Increases: Crouch Movement Speed, Sprint Speed, and Aim Down Sight Speed
Decreases: Recoil Control
Increases: Sprint to Fire Speed and Aim Down Sight Speed
Decreases: Recoil Control
Warzone 2.0 is available on PlayStation 4, PlayStation 5, Xbox One, Xbox Series X|S, and PC.
Source: YouTube/IsaacAndersn