KWA EVE-4 vs EVE-9 Review: Which P90-Platform AEG Should You Run?

The KWA EVE-4 and EVE-9 are KWA’s original-design bullpup AEGs, taking the FN P90’s compact “firearm in the palm of your hand” layout and building it around KWA’s own electric recoil platform — the result is one of the most CQB-friendly SMGs on the UK skirmish scene.

If you’ve ever picked up a P90 and grinned at how small and pointable it is, the EVE series scratches exactly that itch. Both run a V6 gearbox, fire from top-mounted P90-style magazines, and chrono around the 350fps mark out of the box — ready for most UK sites with the right hop tune. The question most buyers are really asking is: EVE-4 or EVE-9? This review covers the build, the internals, how they play on the field, and which one earns your money.

Quick verdict

• Both are bullpup P90-platform AEGs — ultra-compact, fast-handling, built for CQB and close-quarters skirmish.
• EVE-4 (£316.50) is the cleaner, more streamlined compact P90 — pick it if you want the classic P90 silhouette and the lower price.
• EVE-9 (£341.50) adds integrated 20mm RIS/RAS rail real estate for optics and accessories — pick it if you want to bolt on a red dot, light or grip.
• Shared internals: V6 gearbox, ~350fps on 0.20g, ~100rd P90 mags, rotary hop in the thumbhole, Mini Tamiya battery connector.
• Black RIFs — you’ll need a UKARA registration or another valid VCRA defence to buy either in black.

Build & feel

The headline with any P90-layout gun is the bullpup ergonomics. The magazine and gearbox sit behind the trigger, so you get a full-length inner barrel — 10.4 inches on the EVE series — packed into an overall length of just 51cm. That’s submachine-gun compact without sacrificing the barrel length that helps accuracy. At roughly 2.26kg it sits in the hand like a much smaller gun than the figures suggest, and the integrated foregrip and thumbhole layout mean it points instinctively.

KWA has built both EVE models on an alloy upper receiver assembly with a high-density polymer stock and chassis, plus steel charging-handle bars — so the chassis it’s wrapped in is solid rather than the hollow, creaky polymer you sometimes find on budget bullpups. The P90 silhouette is unmistakable, but this is KWA’s original design rather than a 1:1 licensed FN clone, so the detailing is their own.

The big handling difference between the two is rail space. The EVE-9 carries an integrated 20mm RIS/RAS rail section on the receiver, giving you a proper mounting point for a red dot, magnifier, torch or PEQ box. The EVE-4 keeps things more streamlined and closer to the classic clean-topped P90 look. If you’re an iron-sights-and-go player, the EVE-4 is all you need; if you live behind a red dot, the EVE-9 saves you fabricating a mount.

Performance: internals, FPS & hop

Both EVE models run a V6 gearbox — the P90-specific gearbox platform — and chrono at approximately 350fps (±10%) on 0.20g BBs. That’s a sensible all-round UK skirmish figure: hot enough to reach across a CQB room or a mid-range bound, but comfortably inside the typical 350fps AEG site limit at most indoor and outdoor venues. Always chrono on the day and check your site’s specific limits before you play.

Hop adjustment is handled by a rotary hop unit tucked inside the stock thumbhole, reached by opening the port door by hand — very P90, and once it’s dialled in you rarely need to touch it. Feeding comes from standard P90-pattern AEG magazines holding around 100 rounds; the on-site notes recommend King Arms-branded P90 mags for the most reliable feed, which is worth knowing before you stock up on spares.

Power is via a Mini Tamiya connector with rear-wired gearbox routing, so a standard 8.4v NiMH or an 11.1v LiPo (where your site permits LiPo) drops straight in. The fire selector gives you safe, semi-auto and full-auto, with a two-stage trigger for that satisfying P90 trigger feel. KWA’s reputation is built on consistent, well-finished AEG internals, and the EVE series carries that forward — these aren’t a project gun you have to rebuild before they shoot straight.

In the field: skirmish role

This is where the P90 platform earns its keep. At 51cm the EVE is shorter than most carbines and even many MP5-style SMGs, which makes it superb for CQB — clearing corners, fighting through doorways, and snapping between targets in tight indoor sites like The Mall, Combat Action Games-style urban venues, or any close-quarters CQB arena. The bullpup balance keeps the weight back into your shoulder, so it stays light at the muzzle when you’re sweeping rooms.

It’s not just a CQB toy, though. The full-length 10.4-inch inner barrel and 350fps output mean it holds its own at typical woodland and urban-outdoor engagement ranges too. The ~100rd mags strike a nice middle ground — more than a realistic-cap mag, less than a hi-cap rattle-box — so you can lay down suppressing fire without sounding like a maraca every step. For a skirmisher who wants one compact, do-everything primary that’s equally at home indoors and out, the EVE is a genuinely versatile choice.

Variants & which to pick

Because the two guns share a gearbox, FPS, mag system and chassis, your decision really comes down to rails and budget:

• Choose the KWA EVE-4 (£316.50) if you want the cleanest, most authentic compact P90 look, you shoot mostly on irons or a low-profile optic, and you’d rather keep £25 in your pocket.
• Choose the KWA EVE-9 (£341.50) if you know you’ll be running a red dot, magnifier, torch or other accessories, and you want the integrated 20mm RIS/RAS rail to mount them properly from day one.

For most modern skirmishers the £25 step up to the EVE-9 is money well spent — a red dot transforms how fast you can fight a compact bullpup, and having a factory rail beats improvising one. But if you love the stripped-back P90 aesthetic or you’re watching the budget, the EVE-4 gives you the same shooting platform for less.

Upgrades & compatibility

Both EVE models use a V6 (P90-pattern) gearbox, so internal upgrade parts and spares follow the established P90 AEG ecosystem rather than a standard V2/V3 box — worth bearing in mind when you go shopping for tune parts. The rotary hop and standard motor are easy to access, and the Mini Tamiya wiring means battery and connector upgrades are straightforward.

On the externals, the EVE-9’s integrated rail opens up the usual world of red dots, magnifiers and torches with no gunsmithing required. For magazines, stick to good-quality P90-pattern AEG mags — King Arms-branded units are the recommended pairing for reliable feed across both guns, so you can share a mag pool whichever model you run.

FAQ

Is the KWA EVE-4 or EVE-9 worth it?

Yes — for a CQB-focused skirmisher who wants a compact, well-built bullpup that shoots straight out of the box, both represent KWA’s solid AEG engineering. The EVE-9 edges it for anyone running optics thanks to its integrated rail.

What’s the difference between the EVE-4 and EVE-9?

They share the same V6 gearbox, ~350fps output, 100rd P90 mags and 51cm compact chassis. The main practical difference is rail real estate: the EVE-9 adds an integrated 20mm RIS/RAS rail for mounting optics and accessories, while the EVE-4 keeps the cleaner classic P90 look at a slightly lower price.

Do I need a UKARA to buy one?

Both are sold as black Realistic Imitation Firearms (RIFs). To buy a black RIF you need a valid defence under the VCRA — most commonly UKARA registration through a skirmish site. If you don’t yet have a defence, a two-tone version is the legal route, though these models are listed in black.

Can I run it at a UK skirmish site?

Yes. At around 350fps on 0.20g they sit inside the typical AEG limit at most UK indoor and outdoor sites. Always chrono on arrival and confirm your specific site’s FPS and engagement-distance rules before play.

Compact, fast-handling and built on KWA’s proven AEG platform, the EVE series is one of the easiest ways onto the P90 bandwagon. Grab the KWA EVE-4 AEG for the clean compact P90 at the keener price, or step up to the KWA EVE-9 AEG for the integrated rail and optics-ready setup — both in stock now at Airsoft Direct.