Modern Warfare 4 All Apex Attachments Explained: Every Weapon
Every MW4 Apex attachment explained: what each one does, the slots it blocks, how to unlock it, Season 1 changes and which ones to chase first.
In this guide 14 sections
Modern Warfare 4 All Apex Attachments Explained starts with one idea: an Apex is the last reward on a weapon's level track, and each supported gun gets its own. Infinity Ward built them to change what a weapon is for, not to nudge its stats. Some turn a rifle into a sniper, some bolt a launcher or a knife onto the frame, and many lock other Gunsmith slots while equipped. This guide lists every Apex in the game as of Season 1 (November 5, 2026), what each one does in the developer's own patch notes, which slots it takes away, and how we would decide which to chase first.
Quick summary
- 28 Apex attachments shipped at launch on October 23, one for each of the 24 primary weapons and four pistols. Launchers and melee weapons have none (Warzone Season 1 patch notes; Activision's open beta weapons guide).
- Season 1 added two more with the Cronen Osprey (Helix Mk. II) and CSG-35 (CSG Crossfire), and lists the Hyeon Auto and Kastov 545 as Wager Match event rewards.
- You unlock an Apex by fully leveling its weapon. It sits in its own slot, but most of them block one to five regular attachment types (Activision; patch notes).
- Season 1 nerfed the Hyeon Hyperburst and gave longer damage ranges to the M4 Hurricane, Type 73 Assault and Rezi 12 Enforcer (Infinity Ward's Season 1 patch notes).
How Apex attachments work in Modern Warfare 4
Activision's open beta weapons guide (August 27, 2026) sets out the rules. An Apex unlocks once a supported weapon reaches its maximum level. You equip it apart from the standard Gunsmith build, so it doesn't use up one of your attachment slots. And every supported weapon has its own design rather than a shared stat bonus.
What the beta guide doesn't spell out is the trade. The launch descriptions in the Warzone Season 1 patch notes (Raven Software, November 7) end most entries with a line such as "Blocks Barrel and Magazine Attachments." So the Apex is free in slot terms, yet it can still empty out part of your build. Weigh an Apex against the attachments it removes, not on its own.
A few more rules worth knowing before you start leveling:
- Max level varies by weapon. The beta guide listed track lengths from 30 levels (Combat Knife) to 73 (Signal .50), and among guns with an Apex the shortest was the Karit P68 at 34. Those were beta numbers and can differ in the live game, so check the weapon screen for the live count. Our leveling guide covers weapon XP in depth.
- Shared attachments speed you up. In the beta guide each attachment unlocks once for every weapon that can use it, and a level that would award one you already own is skipped with a Bonus Level Up.
- Prestiging a weapon isn't meant to remove its Apex. Infinity Ward's launch patch notes list a fix for Military Camos and Apex attachments that showed as locked again after a weapon Prestige.
- Tuning differs by mode. The same launch notes say Multiplayer and DMZ get separate weapon tuning, so an Apex can feel different in each.
All assault rifle Apex attachments in Modern Warfare 4
The assault rifle class has the most Apex attachments, and the widest spread of roles. Unlock levels are player levels from the Warzone Season 1 patch notes.
| Weapon (unlocks at) | Apex | What it adds | Blocks |
|---|---|---|---|
| Han 86 (start) | Han X20 Skybreaker | Targeting optic and 20mm airburst launcher | Optic, Stock, Barrel |
| M4 (level 14) | M4 Hurricane | Top-loaded 5.7x28mm conversion, more capacity and fire rate | Barrel, Magazine |
| Hyeon Burst (21) | Hyeon Hyperburst | Very fast three-round burst, then slower full auto | None listed |
| Patriot XMR (27) | Patriot XMR Volt | Underbarrel launcher of non-lethal stun darts | Barrel |
| Kastov 762 (34) | Kastov ARC | Disruption barrel and optic that fires an RF pulse | Barrel |
| Oden (39) | Oden Sentinel | Semi-auto sniper conversion with scope, bipod, suppressor | Barrel, Muzzle |
| Axion (52) | Axion Clearcut | Chainsaw rear grip, handlebar foregrip, hip laser, canted aim | Optic, Laser, Underbarrel, Stock, Rear Grip |
| Cronen Squall (55) | Cronen Maelstrom | Guided missile steered with an infrared laser while aiming | Laser, Underbarrel |
| Cronen Osprey (Season 1) | Helix Mk. II | Double-barrel receiver that fires on pull and release | Not stated |
Axion Clearcut
Clearcut strips the Axion's stock and pistol grip and replaces them with a chainsaw-style rear grip, a handlebar foregrip, a hip laser and a canted aiming system, all aimed at hip-fire play on the move. It costs more than any other Apex: five attachment types go dark. In the beta this rifle sat in a Default Loadout with no Gunsmith access, and at launch it unlocks at player level 52.
Our read: treat it as a different weapon. On small 6v6 maps a hip-fire rifle has a clear job. In Ground War or DMZ, where fights stretch out, losing your optic and stock is a heavy price.
Cronen Maelstrom
The Maelstrom launches a precision-guided missile that you steer while aiming down sights with an infrared laser. Fire it without guidance and the patch notes say its effectiveness drops sharply at long range. It blocks the laser and underbarrel slots. Look for the Cronen Squall under assault rifles: the October 25 update in Infinity Ward's launch patch notes fixed a bug that labeled it, the Patriot XMR and the Oden as Battle Rifles in parts of the game. The Warzone Season 1 notes list it in the assault rifle section, even though its description there still calls it a bullpup marksman rifle.
Our read: the missile only pays off if you spend the seconds guiding it, and you're exposed while you do. Learn it in open ground first.
Han X20 Skybreaker
Skybreaker pairs a targeting optic with a launcher that dials in a point within range and bursts a 20mm shell in the air over it. The patch notes add that a direct hit is a dud, so the shell has to burst above the target. The developer pitches it for flushing cover, and it blocks the optic, stock and barrel.
Our read: use it on enemies who have stopped moving behind a wall or a window ledge, not on someone sprinting at you.
Hyeon Hyperburst
Hyperburst gives the Hyeon Burst an overclocked receiver: an extremely quick three-round burst comes first, then the gun drops into slow, controlled full auto. No slot block is listed. Season 1 cut its maximum damage from 30 to 23 and its minimum from 25 to 20, while its maximum damage range grew from 24.64 m to 30.99 m (Infinity Ward's Season 1 notes).
Our read: the opening burst is the point, so practice landing it before you judge the follow-up fire.
Kastov ARC
ARC fits the Kastov 762 with an experimental disruption barrel and an integrated optic. Its alternate fire is a radio-frequency pulse that can disable infantry, knock out electronics and shake up vehicles in its sights. It blocks the barrel slot. Infinity Ward's Season 1 patch notes fixed a bug where that alternate fire could stop working after a Munitions Box or Ammo Cache in Ground War.
Our read: one blocked slot for an extra tool against people, equipment and vehicles is a modest cost, which makes it one of the easier Apex picks to justify.
M4 Hurricane
Hurricane rebuilds the M4 as a top-loading, high-capacity rifle in 5.7x28mm, lighter and quicker firing than the stock version. It blocks the barrel and magazine. Season 1 stretched its maximum damage range from 10.49 m to 11.68 m and left its damage values as they were.
Our read: that range is short next to the base M4, which the same notes list at 27.94 m. If you like the M4 for mid-range fights, the Hurricane is a separate close-range gun rather than an upgrade.
Oden Sentinel
Sentinel converts the Oden bullpup into a semi-automatic sniper rifle with a bipod, a custom suppressor and a sniper scope. It blocks the barrel and muzzle slots, and the launch patch notes trimmed its damage ranges in the first week.
Our read: it overlaps with the real sniper class. It makes sense if the Oden is the rifle you already level, or if you want one platform that covers two roles.
Patriot XMR Volt
Volt adds an underbarrel launcher that sprays a wide spread of 50,000-volt darts. The darts don't kill; they stun the target so you can finish them with normal fire. It blocks the barrel slot.
Our read: switching to an underbarrel takes time you won't have mid-fight. Have it ready before you round a corner into a room.
Cronen Osprey: Helix Mk. II (Season 1)
The Cronen Osprey arrived in Season 1 at Battle Pass tier 16. Its Apex, the Helix Mk. II, swaps in a double-barrel receiver that fires once when you pull the trigger and again when you release it. The Warzone Season 1 notes describe it as the fastest-firing semi-automatic option in the game. They don't list a slot block.
All LMG Apex attachments in Modern Warfare 4
| Weapon (unlocks at) | Apex | What it adds | Blocks |
|---|---|---|---|
| FiNN LMG (level 4) | FiNN Adverse | Unthrottled fire rate that can overheat | None listed |
| Type 73 (9) | Type 73 Assault | Top-mounted magazine of Explosive Rounds | Magazine, Ammunition |
| APOC-338 (44) | APOC-338 Praetor | Ten-round belt, locked to semi-auto | Magazine |
APOC-338 Praetor
Praetor swaps the box feed for a ten-round belt of heavy rounds and locks the APOC-338 to semi-auto. You give up the volume of fire that defines a machine gun and get a lighter weapon with a harder hit per shot. Only the magazine slot is blocked.
Our read: like the Oden Sentinel, it turns the weapon into another class. Try it if you already enjoy the APOC and want a slower, heavier rhythm.
FiNN Adverse
Adverse removes the FiNN's fire rate limit. Hold the trigger too long and the gun overheats, then has to cool down before it returns to full auto. The patch notes don't give a round count for overheating, so learn the limit in a private match. No slot block is listed.
Our read: with nothing blocked, the only cost is managing heat. Fire in bursts and it's close to free.
Type 73 Assault
Assault gives the Type 73 a top-mounted magazine of Explosive Rounds. The notes describe the trade as limited ammo capacity in exchange for stopping power, but neither they nor the beta guide give a round count, so check the magazine size in the Gunsmith stats before you commit. It blocks the magazine and ammunition slots. Season 1 extended its maximum damage range from 22.23 m to 24.13 m and raised its first mid-range damage step from 22 to 23.
Our read: fewer, harder shots suit players who pick their fights rather than hold a lane with sustained fire. Season 1 moved it up.
All SMG Apex attachments in Modern Warfare 4
| Weapon (unlocks at) | Apex | What it adds | Blocks |
|---|---|---|---|
| ISO Nightshade (level 4) | ISO Trace | RFID rounds that mark hit targets on the optic | Optic, Ammunition |
| VEL 46 (13) | VEL 46 Snap | Tactical sling; Quick Draw with Overkill | Stock |
| Wz.55 Striga (21) | Wz.55 Striga Rampage | Akimbo conversion | Optic, Stock, Underbarrel |
| PPSh-41 (27) | PPSh-41 Ember | Underbarrel burst of incendiary projectiles | Barrel, Underbarrel, Magazine |
| X-58 Nyx (34) | X-58 Void | Subsonic stealth kit | Barrel, Ammunition |
| CSG-35 (Season 1) | CSG Crossfire | Akimbo CSG-35s | Not stated |
ISO Trace
Trace loads the ISO Nightshade with RFID ammunition. Each round that hits tags the target, and the integrated optic shows a red dot tracking their movement and direction. It takes over the optic and ammunition slots. The launch patch notes fixed a bug that stopped it working as intended in DMZ.
Our read: the dot shows someone you've already hit, so its value is in chasing a wounded enemy through rooms with several exits. Keep your eyes on the scene, not only the display.
PPSh-41 Ember
Ember mounts an underbarrel that fires a quick burst of pyrotechnic rounds, leaving a patch of fire that burns for a short time. It's area denial, and it blocks three slots: barrel, underbarrel and magazine.
Our read: fire covers more of a small map than a large one. Check how often your usual mode puts you in doorways and choke points before giving up three slots.
Wz.55 Striga Rampage
Rampage converts the Striga for akimbo use: two guns, twice the close-range output, and harder control. It blocks the optic, stock and underbarrel. In the beta the Striga only appeared in a campaign mission; at launch it unlocks at player level 21.
Our read: good inside buildings, poor across open ground.
VEL 46 Snap
Snap fits a tactical sling. You lose the stock slot, and when you run the Overkill perk you get Quick Draw for very fast weapon swaps.
Our read: it only does something if you carry two primaries with Overkill. If you do, one slot is a small price.
X-58 Void
Void is the stealth pick. It makes the already suppressed X-58 Nyx quieter still, hides skulls when enemies die and cuts down directional hit indicators, so targets struggle to tell where the shots came from. It blocks the barrel and ammunition slots.
Our read: if you flank and stay off the minimap, unlock this one early.
CSG-35: CSG Crossfire (Season 1)
The CSG-35 joined in Season 1 at Battle Pass tier 36, with the highest fire rate in its class at 1,200 RPM (Warzone Season 1 notes). Its Apex, CSG Crossfire, makes it an akimbo pair that gives up accuracy for volume. Don't confuse it with the Crossfire killstreak in the same notes.
All marksman rifle Apex attachments in Modern Warfare 4
| Weapon (unlocks at) | Apex | What it adds | Blocks |
|---|---|---|---|
| MAR-9 (level 4) | MAR-9 Auto | Fully automatic conversion | Trigger Action |
| Oris 8.6 (11) | Oris 8.6 Razor | Up to three throwing knives on the receiver | Underbarrel |
| Mosin-Nagant (36) | Mosin Harpoon | Launchable, retrievable bayonet | Barrel, Muzzle |
MAR-9 Auto
MAR-9 Auto converts the semi-automatic DMR to full auto with a higher fire rate, and it blocks the trigger action slot. Season 1 fixed its in-game description, which hadn't matched how it actually behaved, so read the updated text before you judge it.
Our read: it pushes a marksman rifle toward assault rifle work. If you already main the MAR-9, it gives you a second way to play it.
Mosin Harpoon
Harpoon fits the Mosin-Nagant with a spring-loaded ballistic bayonet. It extends your melee lunge, and you can fire the blade at an enemy, then pick it up and use it again. It blocks the barrel and muzzle.
Our read: it's the strangest design in the list. The notes don't give its range or damage, so test both in a private match before you build a class around it.
Oris 8.6 Razor
Razor adds a compact blade module that holds up to three throwing knives for quiet, close engagements. The beta guide described a pair of kunai; the launch text says three. It blocks the underbarrel.
Our read: it's a silent backup for players who don't want to fire and give their position away. Whether it beats drawing a pistol depends on how you play.
All pistol Apex attachments in Modern Warfare 4
| Weapon (unlocks at) | Apex | What it adds | Blocks |
|---|---|---|---|
| Sang 9mm (level 4) | SANG Breach | Single-shell 12-gauge underbarrel | Laser |
| Krait P68 (7) | Krait P68 Commando | Icepick-grip knife in the off hand | None listed |
| .50 GS (41) | GS Magna | Fully automatic .50 GS | Trigger Action |
| Mojave .357 (48) | Mojave Lawless | Fan-the-hammer hip fire | Trigger Action |
GS Magna
Magna turns the .50 GS into a fully automatic pistol, and the developer's own description warns that it isn't built for accuracy. It blocks the trigger action slot.
Our read: treat it as a panic button for the moment someone appears beside you. Past a few meters, expect to miss.
Krait P68 Commando
Commando puts a tactical knife in your off hand in an icepick grip. It raises melee damage and lunge range, and the off hand steadies the pistol for better recoil control. No slot block is listed. In the beta the pistol was spelled Karit P68; launch uses Krait.
Our read: better melee and steadier recoil with nothing blocked is about as cheap as an Apex gets.
Mojave Lawless
Lawless lets you fan the revolver's hammer for rapid hip-fire shots, trading precision for speed. It blocks the trigger action, the same slot as the GS Magna.
Our read: it fills the same role as Magna with a revolver's rhythm. Pick whichever pistol you already like.
SANG Breach
Breach adds an underbarrel chamber that holds one 12-gauge shell. A canted stance braces against the recoil, and the laser slot is blocked. In the beta the Sang 9mm was default-loadout only with no Gunsmith; at launch it unlocks at player level 4.
Our read: one shell can settle a close fight your 9mm wouldn't. Remember that you only get one before a reload.
All shotgun Apex attachments in Modern Warfare 4
| Weapon (unlocks at) | Apex | What it adds | Blocks |
|---|---|---|---|
| Rezi 12 (level 4) | Rezi 12 Enforcer | Pump action and a side-saddle of explosive slugs | None listed |
| Warlord (32) | Warlord Lumen | Strobe that fires when you aim down sights | Optic, Laser |
Rezi 12 Enforcer
Enforcer switches the Rezi 12 to pump action and adds a side-saddle of explosive slugs, so the shotgun can reach past its usual range. No slot block is listed. Season 1 lengthened its damage ranges and raised its minimum damage from 19 to 20.
Our read: it adds range at no listed slot cost, and Season 1 made it a little better. It's an easy one to equip.
Warlord Lumen
Lumen fires a blinding strobe the moment you aim down sights, impairing enemy vision, and then has to recharge before the next use. It blocks the optic and laser slots.
Our read: on a close-range shotgun, a flash that triggers on aim lines up with how you'll fight anyway. Expect it to be one of the most talked-about Apex attachments.
All sniper rifle Apex attachments in Modern Warfare 4
| Weapon (unlocks at) | Apex | What it adds | Blocks |
|---|---|---|---|
| KG-7 Vulcan (level 4) | KG-7 Drillcharge | Side-mounted KG-9 Drillcharge rounds | None listed |
| Astaroth .57 (10) | Astaroth .57 Infiltrator | Sonar and radio pulses that detect enemies through cover | Optic; magazine drops to 1 |
| Signal .50 (35) | Signal Inferno | .50 Cal Incendiary Rounds | Ammunition |
Astaroth .57 Infiltrator
Infiltrator uses sonar and radio-wave pulses to pick up enemies behind cover and walls. The patch notes say the signal's reach through surfaces is limited, the magazine drops to a single round, and the optic slot is blocked.
Our read: the recon helps most on a map you don't know yet. With one round loaded, each shot needs to count.
KG-7 Drillcharge
Drillcharge side-mounts KG-9 Drillcharge rounds on the KG-7 Vulcan. Each one bores into a surface and then detonates, which the developer recommends for enemies dug in behind cover. No slot block is listed.
Our read: use it on players who camp a position, then go back to the rifle.
Signal Inferno
Inferno is an XRK modification that loads the Signal .50 with .50 Cal Incendiary Rounds, raising damage against vehicles and killstreaks considerably. It blocks the ammunition slot. Season 1 fixed the rounds not interacting with smoke as intended.
Our read: worth it in modes where vehicles and killstreaks are common, such as Ground War and DMZ.
Season 1 changes and event Apex attachments
Season 1 started on November 5, 2026. Beyond the two new weapons above, the notes add two event Apex attachments that were in the beta:
- Hyeon Auto converts the Hyeon Burst to full auto for steady, rapid fire.
- Kastov 545 switches the Kastov 762 to 5.45x39mm rounds for smoother handling and faster follow-up shots.
Both are listed as Wager Match event rewards. Infinity Ward's Season 1 notes mark that event as coming soon, and the launch notes explain that the beta's early event Apex attachments were pulled at launch to return later. Infinity Ward also says Apex attachments will be event rewards throughout the live seasons, so expect the list to grow.
Which Apex attachments to unlock first
There isn't a settled community ranking this early in the game's life, so we sorted the list on two things we can check: how many slots each Apex blocks in the patch notes, and which way Season 1 tuning moved it. This is a decision aid, not a tier list. Your weapon choice and mode matter more.
| Group | Apex attachments | Why |
|---|---|---|
| Low cost, easy to justify | Rezi 12 Enforcer, Krait P68 Commando, FiNN Adverse, KG-7 Drillcharge, Kastov ARC, VEL 46 Snap (with Overkill) | No slot block listed, or a single block, for an extra tool |
| Moved up in Season 1 | Type 73 Assault, M4 Hurricane, Rezi 12 Enforcer | Longer damage ranges in Infinity Ward's Season 1 notes |
| Moved down in Season 1 | Hyeon Hyperburst | Maximum damage cut from 30 to 23 |
| Changes the weapon's class | Oden Sentinel, APOC-338 Praetor, MAR-9 Auto, Axion Clearcut, Striga Rampage | Try them if you main that gun; otherwise the base weapon or another class may suit you better |
| Skill and timing heavy | Cronen Maelstrom, Han X20 Skybreaker, Mosin Harpoon | They pay off only when you guide, place or retrieve the shot well |
Example: you play objective modes on the core 6v6 maps with an SMG and a pistol. X-58 Void and Krait P68 Commando suit that style and cost little. The Han X20 Skybreaker can wait until you play a mode with more cover to clear.
Before you commit to a long level track, ask yourself: "I want this Apex because ___, and I'm willing to lose ___ to run it." If the second blank is a slot your build depends on, pick another weapon to level.
Want a hand with this?
If you would rather not grind weapon levels yourself, MW4 weapon leveling is listed on FullBoosts, along with other services on the Call of Duty page. Read the publisher's rules before you buy any service from anyone, FullBoosts included — a marketplace listing isn't publisher permission.
FAQ
What are Apex weapon attachments in Modern Warfare 4? They are weapon-specific attachments you earn at the end of a weapon's level track. Each one changes the gun's role, for example turning the Oden into a semi-auto sniper or giving the MAR-9 full auto (Activision; Warzone Season 1 patch notes).
How many Apex attachments are there in Modern Warfare 4? There were 28 at launch: one each for the 24 primary weapons and the four pistols. Season 1 added the Helix Mk. II and CSG Crossfire, and lists the Hyeon Auto and Kastov 545 as Wager Match event rewards.
How do you unlock Apex attachments in MW4? Use the weapon until it reaches its maximum level. Attachments you already own from other weapons are skipped with a Bonus Level Up, which shortens the track (Activision's open beta weapons guide).
Do Apex attachments take up an attachment slot? No. The Apex has its own slot, but most of them block certain regular attachment types, from one (Kastov ARC, Barrel) to five (Axion Clearcut).
What are the best Apex attachments in Modern Warfare 4? There's no consensus yet. Going by the patch notes, Rezi 12 Enforcer, Kastov ARC, Krait P68 Commando and Type 73 Assault give a lot for a low slot cost, and the Enforcer and Assault were buffed in Season 1.
What are the worst Apex attachments in Modern Warfare 4? None stands out as weak yet. The ones that ask the most are the Axion Clearcut (five blocked slots) and the Cronen Maelstrom (it needs guiding). The Hyeon Hyperburst took the only Apex damage cut in Season 1.
