Modern Warfare 4 Guide: All Season 1 Weapons & How to Unlock Them

Call of Duty: Modern Warfare 4 Season 1 has four confirmed new weapons: Cronen Osprey, CSG-35, JAK 12, and ZLR Talonhawk.

The additions cover an assault rifle, an SMG, a full-auto shotgun, and a combat axe. Two launch through the Battle Pass, while two use seasonal event unlocks.

Use the checklist to track the base weapons, then compare their handling and Apex conversions before choosing what to level. Blueprints and attachments for existing guns are separate from these new weapon additions.

All Season 1 weapons and unlocks

All four base weapons can be earned for free. You do not need the premium Battle Pass or BlackCell to collect the launch weapons from their free reward tiers.

The Call of Duty: Modern Warfare 4 Vault Edition bonuses include access to Season 1 BlackCell, which provides 20 Tier Skip Tokens. Those skips offer a faster route through the pass, not an exclusive route to the base guns.

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How the new Season 1 weapons compare

These are the base ammunition capacities and fire rates for the three firearms, before their Apex conversions.

Fire rate alone does not establish which weapon kills fastest. The Osprey delivers assault-rifle fire, the CSG-35 relies on rapid follow-up hits, and the JAK 12 fires clusters of pellets. Choose around the engagement you intend to take.

Cronen Osprey: start with a conventional assault rifle

The Cronen Osprey fires 5.56 ammunition and combines a fast firing cycle with moderate assault-rifle power. It is the straightforward starting choice if you want a rifle before committing to the close-range specialists.

Sustained fire pulls its recoil up and to the right. Counter that movement while aiming, and use short bursts when keeping shots together becomes more important than maintaining continuous fire.

The rifle has 70 weapon levels. A separate Battle Pass blueprint appears at tier 87, well after its base unlock.

Start with the assault rifle

CSG-35: keep engagements within 20 meters

The CSG-35 has the highest fire rate in its SMG class, but each round deals modest damage. Its strength comes from stacking follow-up hits quickly within 20 meters. Beyond that distance, climbing recoil makes staying on target more difficult.

Use cover to shorten exposed approaches on Call of Duty: Modern Warfare 4's maps, and choose routes that bring opponents into its effective close-range fights. Trying to force an engagement across a long lane works against the weapon's handling.

The CSG-35 has 42 weapon levels, and its Battle Pass blueprint sits at tier 73. Its smaller magazine and faster firing cycle also make ammunition management a more immediate concern than with the Osprey.

JAK 12: close the distance before breaching

The JAK 12 is a full-auto shotgun built for close engagements. Its accuracy falls off quickly with distance, and each shot produces heavy recoil. Use it to breach a room when you expect an enemy behind the door, not to challenge an opponent across an open lane.

Approach through cover before committing to the push. Automatic fire helps sustain pressure once you reach shotgun range, but it does not remove the need to get close.

Built for close-range breaches

ZLR Talonhawk: a combat axe for the melee slot

The ZLR Talonhawk is a dedicated melee-slot combat axe, not a throwable tomahawk. You attack with hacking and slashing strikes.

It has 10 weapon levels and supports Mastery Badges. There are no attachments or Apex conversion to unlock, so its progression focuses on the melee weapon itself instead of a later firing-mode or projectile change.

How to approach the unlock grind

Separate Battle Pass progress from weapon progress

Season 1 uses a linear 100-tier Battle Pass. Work forward through its rewards for the launch guns, then equip an unlocked weapon when you want to begin its individual leveling path.

Battle Pass tiers and weapon levels serve different purposes. Reaching a base weapon reward gets you the gun; progressing that gun toward Weapon Prestige is the route to its Apex conversion. A later Battle Pass blueprint is another reward, not the conversion requirement.

Follow event objectives for the event weapons

Wager Match spans Call of Duty: Modern Warfare 4's Multiplayer and DMZ modes and Warzone. Its Multiplayer offering is Gauntlet 1v1 Gunfight, where you wager in-game Trophies and the winning player stays to face another opponent.

Check the active event objectives and reward track before choosing your next session. Battle Pass tier progression is not the listed unlock route for the shotgun or axe, so keep their event goals separate from your pass target.

The event also awards attachments for existing weapons. If you use the Hyeon Burst or Kastov 762, their conversion rewards give you another reason to pursue Wager Match alongside the new shotgun.

Apex conversions for the new firearms

Prestige the matching weapon

The three new firearms each have an Apex conversion unlocked through Weapon Prestige. Choose which gun to progress based on the conversion you actually want to use, because these attachments change more than a basic handling stat.

The Helix receiver suits a deliberate pull-and-release firing rhythm. Crossfire commits the CSG-35 further toward an accuracy trade-off, while Barrage replaces the shotgun's normal pellet attack with an explosive option. Treat these as different weapon configurations, not automatic upgrades for every engagement.

Season 1 attachments for existing weapons

Event conversions and additional options

Season 1 also changes weapons already in your arsenal. Keep the attachment's type and compatible gun in mind: the M16 Burst Attachment modifies the M4, for example, rather than adding another base rifle to the four-weapon checklist.

Two further in-season additions are the TT Iron Guard Kit for the .50 GS pistol and the ChainSAW Grip set for the FiNN LMG.