KWA Originals · KO Series · AEG Variable PDW · 6mmKO: EVE-4 AEG Variable
Not “just another M4.”
The KWA KO: EVE-4 is a compact 6mm AEG airsoft PDW with a high-strength polymer receiver, KWA’s Variable Performance System for adjustable FPS and a gearbox that is drop-in ready for an ETU. It shoots 330–380 FPS in semi and full auto, weighs 4.9 lb, and comes with one KWA MS120 Midnight 120-round magazine.
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What is the KO: EVE-4?
The EVE-4 is where KO started: KWA announced it in 2021. It may look like “just another M4,” but its high-strength polymer receiver set and M-LOK handguard make it a pound lighter than its sister AEG, the Ronin T6 (4.9 lb vs 5.7 lb).
The side charging handle makes hop-up adjustment convenient, the integrated pistol grip is shaped for comfortable handling, and KO’s slim line vertical grip and KWA’s PDW stock keep it compact. Inside is the same adjustable-FPS (VPS) gearbox used in the Ronin TK.45c, Ronin T6, QRF Mod series and Ronin 47, so you can tune it for indoor and outdoor fields or drop in an ETU later.
Who it is for: players who want a compact, light PDW-style AEG they can tune for indoor and outdoor games.
- AEG Variable Performance System, VPS tool included
- Gearbox drop-in ready for an ETU
- High-strength polymer receiver set, 4.9 lb
- K.O.R.E. 4 M-LOK rail
- Ambidextrous safety selector, magazine release and charging handle
- Switch Life Extender
- PTS flip-up sights, slim line vertical grip, PDW stock (Gen. 2)
- Takes M4/AR15-style AEG magazines
KO: EVE-4 Features
AEG Variable Performance System (VPS)
Adjust FPS for indoor and outdoor games.VPS builds FPS adjustment into the gearbox. Set anywhere from 330 to 380 FPS with the included VPS tool, so one rifle can play anywhere.
Ambidextrous Controls
For every player.Built for left- and right-handed players, with an ambidextrous safety selector, magazine release and charging handle.
Ready-to-Drop-In Gearbox
Upgrade with an ETU.The gearbox is designed for drop-in upgrades with popular electronic trigger units, no modifications needed.
Switch Life Extender (SLE)
Protect your trigger switch.The KWA SLE minimizes electrical arcing, reducing wear on the trigger switch for better reliability and durability.
PTS Flip-Up Sights
Included as standard.PTS Enhanced Polymer flip-up sights come standard, so the rifle is ready to aim out of the box.
KO Magazine
A color accent magazine.KO magazines are KWA MS120 magazines with an extra pop of color to help you stand out.
Side Charging Handle
Makes hop-up adjustment convenient.
Integrated Pistol Grip
Shaped for comfortable, consistent handling.
Slim Line Vertical Grip
KO’s slim vertical grip comes with the rifle.
QD Sockets
Optional quick detach sockets front and rear.
See the KO: Eve
KWA KO: Eve. A closer look at the KO: Eve.
KO: EVE-4 Specifications
| Performance | |
|---|---|
| Power system | AEG Variable (VPS) |
| Velocity | 330–380 FPS, adjustable |
| Rate of fire | 18.3+ rounds per second |
| Firing modes | Safe, semi-auto, full auto |
| Magazine | M4/AR15-style AEG, MS120 Midnight 120-round included |
| Hop-up | Adjustable |
| Motor | KWA high torque motor |
| ETU | Drop-in ready |
| Battery | 11.1V Li-Po, T-plug (Deans) connector (not included) |
| Dimensions | |
| Length | 21 in retracted, 26 in extended |
| Height | 9 in |
| Outer barrel | 7 in |
| Weight | 4.9 lb |
| Build | |
| Platform | PDW |
| Receiver | High-strength polymer |
| Rail | K.O.R.E. 4, M-LOK |
| Stock | PDW stock, Gen. 2 |
| Muzzle | KWA SOCOM muzzle brake |
| Sights and grip | PTS flip-up sights, KWA front grip |
| Included tools | VPS tool |
| Collection | KO Series (KWA Originals) |
Which magazines fit? See the KWA magazine compatibility chart.
What comes with the KO: EVE-4
In the box
- KO: EVE-4 AEG Variable rifle
- One KWA MS120 Midnight 120-round magazine
- KO slim line vertical grip
- VPS tool
You will also need
- An 11.1V Li-Po battery with a T-plug (Deans) connector and a Li-Po charger (not included). The KWA 11.1V 1400mAh Li-Po is the battery KWA packs in the KO: EVE-4 Starter Bundle.
- 6mm airsoft BBs
- Full-seal eye protection
Popular add-ons
How the KO: EVE-4 works
Adjusting FPS with VPS
The Variable Performance System changes power at the gearbox. On the EVE-4 you adjust it with the included VPS tool, within 330–380 FPS.
Fields set velocity limits, often lower indoors than outdoors. Set the rifle for the field you are playing and confirm it at chrono.
Which magazines to use
The EVE-4 takes M4/AR15-style AEG magazines. It comes with one KWA MS120 Midnight 120-round magazine, and MS120 3-packs in Ice, Mint and Midnight are sold separately.
Ready for an ETU upgrade
The gearbox is drop-in ready for popular electronic trigger units, so an upgrade needs no gearbox modification.
If you would rather start with an ETU already installed, the Ronin T6 and T10 ship with the KWA ETU.
Choosing a battery
The battery and charger are not included. This rifle takes 11.1V Li-Po batteries with a T-plug (Deans) connector.
Match the connector, check that the battery fits the stock or battery space, and charge it only with a charger made for that battery type. Ask KWA if you are not sure which size fits.
Get the KO: EVE-4 as a bundle
New to airsoft, or buying for someone who is? The KO: EVE-4 Starter Bundle packs the KO: EVE-4 with a KWA MS120 Ice/Mint/Midnight 3-pack and a KWA 11.1V 1400mAh Li-Po battery.
The First Mission Bundle KO: EVE-4 adds a KWA 140-round BB loader and KWA 0.20g Bio BBs to the same kit.
You will still need a Li-Po charger and full-seal eye protection.
Hop-up, explained
Hop-up puts backspin on the BB so it lifts and flies flatter and farther. Too little and BBs drop early. Too much and they climb.
- Start with the hop-up at its lowest setting.
- Fire a few shots at a target at your usual distance.
- Add a little hop at a time until BBs fly flat before they drop.
- Back it off if BBs start to rise. Re-check whenever you change BB weight.
Compare the KO family
Every KO shoots 330–380 FPS adjustable with VPS, runs an 11.1V T-plug Li-Po battery, has ambidextrous controls and PTS flip-up sights, and has a gearbox that is drop-in ready for an ETU. Here is how they differ.
| EVE-4 | EVE-9 | EVE-9 FDE | AVA-4 | LUCY-4 | RAINE-4 | IRIS-4 | SCARLETT-47 | |
|---|---|---|---|---|---|---|---|---|
| Magazine included | MS120 Midnight | MS120 Midnight | MS120 | QRF Mod 1 | QRF Mod 3 | QRF Mod 2 | TK.45 80-round | Ronin 47 |
| Capacity | 120 | 120 | 120 | 80 | 80 | 120 | 80 (120 compatible) | 120 |
| Rate of fire | 18.3+ rps | 18+ rps | 18+ rps | 21+ rps | 21+ rps | 21+ rps | 21+ rps | 21+ rps |
| Length | 21–26 in | 27.5–30.5 in | 27.5–30.5 in | 21.25–26 in | 21.25–26 in | 22–26.75 in | 22–26.75 in | 23.5–28.125 in |
| Outer barrel | 7 in | 10.5 in | 10.5 in | 7 in | 7 in | 7.125 in | 7 in | 8.5 in |
| Weight | 4.9 lb | 5.6 lb | 5.6 lb | 5 lb | 5 lb | 5.1 lb | 5.2 lb | 5.4 lb |
| Stock | PDW, Gen. 2 | PTS EPS | PTS EPS | PDW, Mod 1 style | PDW, Gen. 2 | PDW, Gen. 2 | PDW, Gen. 2 | PDW, Gen. 2 |
| Rail | K.O.R.E. 4 | K.O.R.E. 9 | K.O.R.E. 9 | K.O.R.E. 4 | K.O.R.E. 4 | K.O.R.E. 4 | K.O.R.E. 4 | K.O.R.E. 4 |
Lengths are retracted to extended. rps = rounds per second. Specs are from each model’s Specifications tab.
KO: EVE-4 care and parts
- Disconnect the battery whenever you are not using the rifle.
- Charge with a charger made for your battery type (NiMH or Li-Po/Li-Fe).
- Keep the inner barrel and hop-up bucking clean if accuracy drops.
- Wipe the rifle down after each game and check screws and the rail before you play.
Find the manual and diagrams in the KWA Resources tab on this page, or in the Manuals & Diagrams library.
KO: EVE-4 FAQ
What is the KWA KO: EVE-4?
A compact 6mm AEG airsoft PDW from KWA’s KO (KWA Originals) series, with a high-strength polymer receiver, adjustable FPS (VPS) and a gearbox that is drop-in ready for an ETU. It weighs 4.9 lb.
How many FPS does the EVE-4 shoot?
KWA lists it at 330–380 FPS, adjustable with VPS. The VPS tool is included. Set it for your field and confirm it at chrono.
Is the EVE-4 ambidextrous?
Yes. It has an ambidextrous safety selector, magazine release and charging handle.
Can I add an ETU?
Yes. The gearbox is drop-in ready for popular electronic trigger units, with no modifications needed.
Which magazines fit the EVE-4?
M4/AR15-style AEG magazines. It comes with one KWA MS120 Midnight 120-round magazine.
What battery does it use?
An 11.1V Li-Po battery with a T-plug (Deans) connector. The battery and charger are not included.
Is there a starter bundle for the EVE-4?
Yes. The EVE-4 Starter Bundle adds a MS120 Ice/Mint/Midnight magazine 3-pack and a KWA 11.1V 1400mAh Li-Po battery. The First Mission Bundle adds the same plus a 140-round BB loader and 0.20g Bio BBs.
Can I pay for the KO: EVE-4 AEG Variable over time?
Yes. Choose Klarna at checkout to split it into 4 interest-free payments, or Affirm to pay over time. Both are subject to approval. See Payment Options.
Do I earn KWA Rewards points on the KO: EVE-4 AEG Variable?
Yes. KWA Rewards members earn 1 point for every $1 on orders of $50 or more, so the KO: EVE-4 AEG Variable earns about 260 points, worth $5.20 in store credit (50 points = $1). See KWA Rewards.
Is the EVE-4 covered by a warranty?
Every KWA gun is backed by KWA, with warranty support and in-house service in California. Protection Plus adds extended warranty coverage and a repair plan with no repair fee, discounted parts and free return shipping. See the Protection Plus page for plan details.
