ARCTURUS X C.A.T. Versatile-10S AK AEG FE™

ARCTURUS
Code: ACR-01-044943-00
£269.99
  • 6.02mm Tightbore inner barrel
  • FE™ Programmable MOSFET/ETU
  • Sleek and skeletonised design

The Speedsoft style doesn't always need to be bright colours and HPA tanks. Sometimes, it looks like a gun straight out of a futuristic COD game! The ARCTURUS X C.A.T. Versatile-10S AK AEG FE™ has an extremely unique design and equally unique ARCTURUS Centaur V2 gearbox. The enhanced internals and FE™ programmable MOSFET/ETU system make for some impressive shooting, too.

This rifle is clearly based on the Russian AK rifle; however, it is a far cry from the original Kalashnikov platform. With its extremely skeletonised design and modern style, the only tell that it's an AK is its curved magazine! The skeletonised M-LOK /20mm Picatinny hybrid handguard allows for plenty of accessories while being super fast to steer between targets thanks to its ultra-low weight.

Plus, its snag-reduced receiver design features ambidextrous controls to ensure your weapon handling is super slick, whether you're left or right-handed. The C.A.T. Versatile series from ARCTURUS offers fully modular platforms in which you can change the handguard, stock and even the magazine well! The versatile part of the name really makes sense...

Full description

Description

Airsoft guns don't need to look realistic; they need to function. The ARCTURUS X C.A.T. Versatile-10S AK AEG FE™ is a radical re-envisioning of the AK assault rifle, ditching the clunky design and weight that the AK is known for and instead cutting down on excess weight and making a skeletonised, ultra-light rifle. This, combined with the modular magwell, ARCTURUS Centaur FE™ gearbox, and ambidextrous controls, makes for an incredible rifle, with an absolutely unique style!

Inside, the ARCTURUS X C.A.T. Versatile-10S AK AEG FE™ is well equipped, boasting a split gearbox for easy maintenance and upgrades, fitted with plenty of high-quality parts focused on reliability, low friction and easy maintenance. The Centaur split gearbox features 18:1 ratio CNC steel gears running on 8mm ball-bearing bushings, a CNC POM air nozzle with internal O-ring, a CNC stainless steel cylinder and a tuneable sector gear allowing pre-cocking to be adjusted mechanically.

Naturally, the inner barrel is a 6.02mm tightbore made from stainless steel, an ARCTURUS standard which has the edge in rigidity when compared to standard brass tightbores. The FE programmable MOSFET makes these superb internals even better, offering a vast range of customisation options ranging from programmable fire modes to adjustable pre-cocking, adjustable trigger sensitivity and adjustable trigger reset!

Starting at the front, we can find a compensator styled after the real steel SLR Synergy compensator, furnishing the front end with a menacing look straight out of the box. The compensator is made from aluminium and flawlessly machined, though if you need a tracer to light the enemy up or a suppressor for a clandestine look, you'll be pleased to learn that the alloy outer barrel features 14mm CCW male threading, ready for the most common alternative muzzle devices in Airsoft.

Behind that, we come to the skeletonised handguard, an ultra-light minimalist design which gives you the attachment interfaces you need without slowing you down with unnecessary weight. At the 3, 6, 9 and 12 o'clock positions, we're equipped with M-LOK negative space attachment slots, ready to rock with the most modern accessory interface out there, capable of mounting M-LOK accessories directly or 20mm accessories using 20mm rail adapters. At the 6 and 12 o'clock positions, the handguard boasts short sections of 20mm Picatinny rail built in, allowing foregrips, tactical flashlights, laser aiming modules and the included set of flip-up aperture iron sights to be mounted with ease.

Next up, we reach the receiver, which is one of the most exciting parts of this build. Starting with the standard stuff, the upper is rocking a 20mm Picatinny rail which seamlessly mates with the handguard's upper rail, providing plenty of space for practically any optical sight setup, including red dot and magnifier combos. The rear of the receiver also features the up-and-coming 1913/20mm Picatinny stock interface found on MCX, MPX and VMP-2 series rifles, allowing you to fit a range of skeletonised side folding stocks, buffer tube adapters, visor stocks and more to suit the mission at hand.

Packed with innovation and made with a design philosophy focused on pure functionality in-game, this receiver features ambidextrous AR-15 style controls and a snag-reducing design with the usual protrusions of standard AR receivers omitted to improve handling while the adrenaline is pumping. The charging handle, located at the top rear of the receiver, has been reprofiled to be as small as possible while maintaining functionality, resembling modern SMG designs like the MP7 and MP9, which require concealability and snag-free operation to fulfil their battlefield role.

Pulling the charging handle back will retract the mock bolt on the right side of the receiver, revealing the rotary HOP-up adjuster inside the mock ejection port. The HOP-up allows you to adjust backspin applied to your BBs to increase range and tune for different ammo weights, seeking the flattest possible trajectory. The rotary design is the most modern unit design for M4/AR-15 AEGs. When your HOP-up is adjusted to the sweet spot for your choice of BBs, you can hit the ambidextrous bolt release on either side to send the mock bolt home.

The fire selector switch is right where any M4 user will expect, above the pistol grip, offering 3 modes of fire by default in a SAFE-SEMI-AUTO layout. Being an ambidextrous design, the fire selector is present on either side, ideal for left or right-handed shooters and those who like to make the best use of cover through shoulder-to-shoulder transitions. Being equipped with the FE™ programmable MOSFET, the fire selector can be configured however you like, from burst mode to binary trigger with ramping full-auto!

The pistol grip itself is a slim, ergonomic design with artificial stippled panels on either side to improve traction for wet-weather operations. The backstrap is filled out to support the web of the hand comfortably, and the grip angle is slightly more vertical than most pistol grips to reduce wrist fatigue when shooting in modern stances with the stock fully collapsed. The trigger guard is built into the receiver and significantly enlarged, allowing easy access to the speedy flat trigger so you can pump out those double taps up close for improved hit probability.

The magazine well may just look like a standard AK build, but you are wrong! This is the highlight of the ARCTURUS C.A.T. series, the modular magwell that can be swapped so you can run your AK with different calibre styles of magazines! This will require tools, but is quite simple to carry out; we're waiting for the aftermarket magwells so we can try out some crazy new gun styles!

The default magazine well on this receiver offers an ambidextrous magazine release, making use of the M4/AR-15 style push-through release on the right side and paddle on the left side. The M4 magazine releases don't work; instead, you're treated to the classic AK form. This allows for left and right-handed use, and the dynamic mag-flip emergency reload if you don't mind damaging a magazine from time to time. The C.A.T. Versatile-10S AK is compatible with ARCTURUS AK magazines and may work with other brands.

As we arrive at the rear, the innovation doesn't end! Mounted to the 1913/20mm Picatinny stock interface, we are treated to a side-folding modular stock and a 6-position M4/AR-15 buffer tube. The stock is extremely sleek with a low-profile design, ensuring it is unlikely to get caught on anything on the battlefield. Its modular design allows you to change the rear of the stock, and the length of the butt plate can be adjusted to fit your loadout perfectly.

The battery compartment is inside the buffer tube and accessible with the stock removed. To do this, simply pull the adjustment lever out as far as possible (you can use an allen key to help) and hold it in place as you slide the stock off to the rear. Inside the buffer tube, you'll find a Deans battery connector to which you mount your choice of battery. We recommend a 7.4V 1300mAh LiPo battery in stick configuration for an easy fit and perfect performance.

Inside, this AK has yet more innovation on board! The gearbox is a version 2-derived design, known as the ARCTURUS Centaur split gearbox. The split shell design of this gearbox makes tuning an absolute breeze, allowing you to change springs and other cylinder group parts while keeping the gears and trigger components in the lower shell in place to avoid re-shimming and repositioning fiddly, awkward parts.

The default setup is 18:1 CNC steel gears running on 8mm ball bearing bushings, a CNC stainless steel cylinder, a CNC POM nozzle with an inner O-ring to improve airseal qualities, and a tuneable sector gear which allows mechanical pre-cocking to be adjusted for a frightening trigger response. Also inside is a 6.02mm stainless steel tightbore inner barrel, offering improved accuracy potential and a slight FPS boost, along with rigidity benefits over brass tightbore barrels.

The FE™ programmable MOSFET/ETU system is an amazing addition, offering a wide range of programmable fire modes, adjustable pre-cocking, adjustable trigger sensitivity and reset, low/high voltage protection, algorithm-guided progressive trigger and adaptive hair trigger, to name but a few! While the default trigger pull is quite long, once you've delved into the FE MOSFET settings, you'll be able to tune the trigger to suit your preferences easily, with options ranging from a realistic full pull to "sneeze nearby to fire" levels of sensitivity, with an adjustable reset for snappy follow-up shots!

The innovative C.A.T. Versatile series from ARCTURUS takes modular to a whole new level. We've seen magwell adapters before, but never a fully interchangeable one between multiple platforms, allowing you to use a KRYTAC-style magwell on an AK when they're available! Plus, its skeletonised design is perfect for staying agile on the battlefield, the perfect blend of Airsoft and speedsoft.

Features

  • High density polymer/Aluminium build - Alloy outer barrel, CNC alu handguard & buffer tube
  • FE™ Programmable MOSFET/ETU pre-installed - Advanced functions built-in!
  • 6.02mm Stainless steel tightbore inner barrel - Superb accuracy potential
  • 14mm CCW Male threaded outer barrel - Tracer/suppressor ready
  • SLR Synergy styled compensator - Stylish, aggressive aluminium muzzle device
  • Skeletonised M-LOK/20mm Picatinny hybrid handguard - Ultra-fast to point, M-LOK & 20mm Picatinny compatible
  • 20mm Picatinny railed receiver - Ready for a red dot sight or scope
  • Snag-reducing receiver design - Brass deflector & forward assist removed for improved handling
  • Ambidextrous magazine release - Classic AK with extended paddles
  • Ambidextrous fire selector switch - Low-profile, ergonomic design, SAFE - SEMI - AUTO config.
  • Low-profile charging handle - Minimalist shape to reduce snag potential (MP7/MP9 style)
  • Ambidextrous mock bolt release - Use the catch on the left or right to drop the bolt after HOP-up adjustment
  • Ergonomic pistol grip - Stippled styled surface on each side for traction
  • Modular magazine well system - Switch the magwell out for M4, AK or short 9mm magwells (available separately)
  • 1913/20mm Picatinny stock interface - Mount MCX, MPX and other 1913/20mm compatible stocks
  • Modular stock - 3 Choices of butt plate length
  • 5-Position M4/AR-15 buffer tube - Adjust the stock to suit your body type and loadout
  • Rear wired: Deans connector - Recommended battery: 7.4V 1300mAh LiPo in stick config
  • Version 2 Split gearbox (ARCTURUS V2 Centaur):
    • Alloy shell
    • Microswitch trigger
    • FE™ Programmable MOSFET/ETU
    • 18:1 CNC Steel gears with tuneable sector gear
    • CNC POM Nozzle with O-ring
    • CNC Stainless steel cylinder
    • Quick change spring guide
  • FE™ Programmable MOSFET Functions:
    • Adjustable pre-cocking (7 levels)
    • Adjustable active braking (8 levels)
    • Adjustable trigger sensitivity ( 5 levels)
    • Adjustable trigger reset distance (5 levels)
    • Algorithm-guided progressive trigger
    • Adaptive hair trigger
    • Programmable fire modes
    • Binary trigger with ramping full auto
    • Low/high voltage protection
  • Compatible with ARCTURUS AK magazines - May work with other brands too

Package Includes

  • ARCTURUS X C.A.T. Versatile-10S AK AEG FE™
    • 550rnd Hi-Cap AK Magazine
    • Iron Sight Set
    • Deans to Mini-Tamiya Connector
    • Spring reset tool
    • Allen keys
    • PVC Patch

Specification

General

Weapon Construction External
Weapon Type
Assault Rifle, Submachine Gun,
Over 18 Only Icon
Over 18
Yes
Icon UKARA - United Kingdom Airsoft Retailer Association
Defence / UKARA Required
Yes, No,
FPS Icon
FPS, using 0.20g BB
Approx.330fps ± 10%, using 0.20g BB
Site Legal Icon
Site Legal, using 0.20g BB
Yes
Screwdriver Icon
Pre-Built
Yes
Package
Included Items
  • Magazine
  • Allen Key
  • Ironsight Set
  • Stock Extension Plates
  • PVC Patch
Skill Level Icon
User Skill Level
Beginner Player, Regular Player,
Patrol Base - Warning Icon
Warnings
Li-Po
Li-Po - Never Leave Charging Unattended
Li-Po - Only Use Approved Chargers
Li-Po - Charge in a Fire Safe Area

Weight and Dimension

Weight KG Icon
Weight (KG)
Approx. 2.13kg
Weapon Length Collapsed
Length (Collapsed)
76cm
Weapon Length Extended
Length (Extended)
84cm

Construction

Colour Wheel Greyscale
Primary Colour
Black
Construction Icon
Construction
CNC Aluminium handguard, muzzle brake & buffer tube. Steel gas tube and stock adapter. Alloy outer barrel & trim parts. High density polymer receiver, mag well, drop stock adapter & stock.
Weapon Construction External
External Construction
Polymer
Alloy
Aluminium
Steel
Gearbox Icon
Internal Construction
Polymer
Alloy
Aluminium
Steel

Weapon Specific

Power Source Icon
Powered By
Electric
Blowback Icon
Blowback
None
Weapon Platform
Weapon Platform
Assault Rifle, AK, ARCTURUS AK AEG,
Magazine Style Icon
Magazine Style
Long Gun Magazine, Assault Rifle, AK Platform,
Fire Select Icon
Fire Selector
PatrolBase | Fire Select Safe
Safe
Patrol Base | Fire Select - Semi Automatic
Semi Automatic
Patrol Base | Full Automatic
Full Automatic
Programmable
Weapon Safety Features Icon
Safety Features
Trigger Disconnect
Shooter Configuration Icon
Shooter Configuration
Ambidextrous
Weapon Configuration Icon
Weapon Configuration
Standard
Weapon Scale Icon
Weapon Scale
1:1
Suggested BB Weight
Suggested BB Weight
0.25g

Hop-Up

Hop-Up Unit Icon
Hop-Up Unit
Yes
Hop-Up Unit Adjuster Icon
Hop-Up Adjuster
Rotary
Hop-Up Unit Location Icon
Hop-Up Location
Behind the mock bolt carrier, accessible with the charging handle pulled and the mock bolt locked back.

Furniture

Weapon Furniture Icon
Furniture
  • Railed Handguard
  • Ambidextrous Charging Handle
  • Railed Receiver
  • Ambidextrous Magazine Release
  • Ambidextrous Fire Selector
  • Ambidextrous Bolt Release
  • Ergonomic Pistol Grip
  • AR Buffer Tube
  • Threaded Outer Barrel
  • Muzzle Brake
  • Enlarged Trigger Guard
  • Flat trigger
  • M-LOK Handguard
  • Side folding stock
  • 1913/Picatinny stock attachment
  • Modular magazine well
Rail System Icon
Rail System
20mm RIS / RAS, 20mm Railed Receiver, M-LOK,
Icon Stock Positions
Stock Setting
Sliding, Multi-Position, Folding, 1913/20mm Picatinny Stock Attachment Interface,
Weapon Length Extended
Stock Positions
6 Position
Sight Type Icon
Sight Type
Iron Sights, Aperture Iron Sight,
Sling Plate Icon
Sling Options
Stock, QD, Loop,

Barrel

Outer Barrel Length (in)
11.6''
Icon Thread Type
Outer Barrel Thread Type
Male
Icon Thread Direction
Outer Barrel Thread Direction
CCW (Counter Clockwise)
Outer Barrel Thread Size
Outer Barrel Thread Size
14mm
Inner Barrel Diameter
Inner Barrel Diameter
6.02mm
Inner Barrel Length
Inner Barrel Length
250mm

Magazine Specific

Magazine Type
Magazine Type
AEG, High Capacity,
Magazine BB Capacity
Magazine BB Capacity
Approx. 550 Rounds
Magazine BB Fill Method
Magazine BB Fill Method
Fill Window
Magazine BB Fill Location
Magazine BB Fill Location
Top

Electric Gun Specific Information

Gearbox
Gearbox Icon
Gearbox Version
V2 Gearbox
Wiring Icon
Gearbox Wiring
Rear Wired
Spring Change Icon
Gearbox Quick Change Spring
Yes
Digital Trigger Icon
Gearbox Electronic Trigger
Yes
Split Gearbox Icon
Split Gearbox Design
Yes
Motor
Airsoft Motor Icon
Motor Type
High Torque
Battery Specific
Battery Connector
Battery Connector
Patrol Base | Icon | Deans
Deans
Compatible Battery
Compatible Battery Type
Compatible Battery Type
Li-Po
Compatible Battery Configuration
Compatible Battery Configuration
Stick
Compatible Battery Voltage
Compatible Battery Voltage
7.4v

Product Testing Data

Notepad Icon
Test Description
330 FPS +/- 10%
Notepad Icon
Tested Using
0.20g Delta Armory EAGLE™ BBs
Notepad Icon
Test Date
04/09/2025

Size guide

Joule Charts

Special Instructions

These table can be used as a reference to see if the BB weight you are using will be over acceptable Joulage limits at some Airsoft Sites in the UK. To check if the weight can be used chrono your weapon using the BB you intend to use, and then compare it to the chart.

FPS, Power and Joule Limits can vary from site to site, so please get in touch with where you're going to play with in advance to avoid disappointment.

Suggested limits are based on Joulage Limit rules used Halo Mill: Proving Grounds, with a 350fps limit for Automatic Replicas, 400fps for Semi-Automatic Replicas, and 500fps for Bolt Action Replicas.

Tap the tabs below to open the relevant chart for your replica.

Suggested limits are based on Joulage Limit rules used Halo Mill: Proving Grounds, and is the equivalent of 350fps, using 0.20g BB resulting in an upper limit of 1.14j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
325 0.98 1.23 1.37 1.47 1.57 1.77 1.96 2.11 2.21 2.45
328 1.00 1.25 1.40 1.50 1.60 1.80 2.00 2.15 2.25 2.50
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
335 1.04 1.30 1.46 1.56 1.67 1.88 2.09 2.24 2.35 2.61
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
345 1.11 1.38 1.55 1.66 1.77 1.99 2.21 2.38 2.49 2.76
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
355 1.17 1.46 1.64 1.76 1.87 2.11 2.34 2.52 2.63 2.93
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01

Suggested limits are based on Joulage Limit rules used at Halo Mill: Proving Grounds, and is the equivalent of 400fps, using 0.20g BB resulting in an upper limit of 1.49j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01
370 1.27 1.59 1.78 1.91 2.03 2.29 2.54 2.73 2.86 3.18
380 1.34 1.68 1.88 2.01 2.15 2.41 2.68 2.88 3.02 3.35
390 1.41 1.77 1.98 2.12 2.26 2.54 2.83 3.04 3.18 3.53
400 1.49 1.86 2.08 2.23 2.38 2.68 2.97 3.20 3.34 3.72
410 1.56 1.95 2.19 2.34 2.50 2.81 3.12 3.36 3.51 3.90

Suggested limits are based on Joulage Limit rules used at Halo Mill: Proving Grounds, and is the equivalent of 500fps, using 0.20g BB resulting in an upper limit of 2.32j.

Velocity BB Weight (Grams)
FPS 0.20 0.25 0.28 0.30 0.32 0.36 0.40 0.43 0.45 0.50
250 0.58 0.73 0.81 0.87 0.93 1.05 1.16 1.25 1.31 1.45
260 0.63 0.79 0.88 0.94 1.00 1.13 1.26 1.35 1.41 1.57
270 0.68 0.85 0.95 1.02 1.08 1.22 1.35 1.46 1.52 1.69
280 0.73 0.91 1.02 1.09 1.17 1.31 1.46 1.57 1.64 1.82
290 0.78 0.98 1.09 1.17 1.25 1.41 1.56 1.68 1.76 1.95
300 0.84 1.05 1.17 1.25 1.34 1.51 1.67 1.80 1.88 2.09
310 0.89 1.12 1.25 1.34 1.43 1.61 1.79 1.92 2.01 2.23
320 0.95 1.19 1.33 1.43 1.52 1.71 1.90 2.05 2.14 2.38
330 1.01 1.26 1.42 1.52 1.62 1.82 2.02 2.18 2.28 2.53
340 1.07 1.34 1.50 1.61 1.72 1.93 2.15 2.31 2.42 2.68
350 1.14 1.42 1.59 1.71 1.82 2.05 2.28 2.45 2.56 2.85
360 1.20 1.51 1.69 1.81 1.93 2.17 2.41 2.59 2.71 3.01
370 1.27 1.59 1.78 1.91 2.03 2.29 2.54 2.73 2.86 3.18
380 1.34 1.68 1.88 2.01 2.15 2.41 2.68 2.88 3.02 3.35
390 1.41 1.77 1.98 2.12 2.26 2.54 2.83 3.04 3.18 3.53
400 1.49 1.86 2.08 2.23 2.38 2.68 2.97 3.20 3.34 3.72
410 1.56 1.95 2.19 2.34 2.50 2.81 3.12 3.36 3.51 3.90
420 1.64 2.05 2.29 2.46 2.62 2.95 3.28 3.52 3.69 4.10
430 1.72 2.15 2.40 2.58 2.75 3.09 3.44 3.69 3.86 4.29
440 1.80 2.25 2.52 2.70 2.88 3.24 3.60 3.87 4.05 4.50
450 1.88 2.35 2.63 2.82 3.01 3.39 3.76 4.04 4.23 4.70
460 1.97 2.46 2.75 2.95 3.15 3.54 3.93 4.23 4.42 4.91
470 2.05 2.57 2.87 3.08 3.28 3.69 4.10 4.41 4.62 5.13
480 2.14 2.68 3.00 3.21 3.42 3.85 4.28 4.60 4.82 5.35
490 2.23 2.79 3.12 3.35 3.57 4.02 4.46 4.80 5.02 5.58
500 2.32 2.90 3.25 3.48 3.72 4.18 4.65 4.99 5.23 5.81
510 2.42 3.02 3.38 3.62 3.87 4.35 4.83 5.20 5.44 6.04