CYMA CM.113B AKS-74U Zco Custom AEG; Kestrel Basic ETU

CYMA
Code: FB4149E
£459.99
  • Full metal construction
  • 6.03mm Tightbore inner barrel
  • EShooter Kestrel Basic ETU/MOSFET pre-installed

Stylish modern AKs are a gorgeous way to take your Russian loadout into the 20th century! The CYMA CM.113B AKS-74U Zco Custom AEG is a compact powerhouse designed to dominate the battlefield and look good whilst doing so. This beast boasts full metal construction with a hefty steel receiver along with flawlessly machined external enhancements inspired by real steel Zco parts. With a dynamic and individualistic style, the CM.113B is perfect for any contemporary AK-themed loadout!

Internally, we're treated to CYMAs high-speed E-Edition internals, including 13:1 high-speed CNC steel gears running on 8mm ball bearing bushings, a polymer piston with a full steel tooth rack, a CNC aluminium piston head and cylinder head, a high-speed Neodymium magnet motor, low-resistance wiring and a 6.03mm tightbore inner barrel. Also inside is the EShooter Kestrel Basic ETU, offering 3-round burst and binary trigger, adjustable pre-cocking, active braking, cycle completion, low battery warning and low/high voltage protection.

So, if you're keen on a modern Russian loadout or you like the one-of-a-kind Zco style, the CYMA CM.113B AKS-74U Zco Custom AEG; Kestrel Basic ETU should be just the platform for you, plus, its compact but highly adjustable design makes it great for pretty much any playstyle!

Full description

Description

If you're in search of a menacing compact AK platform bristling with modern accessory interfaces, the CYMA CM.113B AKS-74U Zco Custom AEG; Kestrel Basic ETU should have your attention! Constructed with a hefty stamped steel receiver and authentically replicated Zco furniture, this pure Russian "Krinkov" AK is at the cutting edge of modern AK configurations and is packing CYMA's best internals yet!

Externally, the AKS-74U Zco Custom is rocking the B11 20mm Picatinny railed handguard paired with the B19 upper handguard, a B18 raised optics mount, PT-1 multi-adjustable stock, a fantastic replica of the RK-3 pistol grip and the squat yet menacing DTK-2 muzzle brake made from steel up front, completing the Zco style build. 

Inside, the AKS-74U Zco Custom is based around the sensational CYMA Platinum E-EDITION High Speed internals, rocking a high torque Neodymium magnet motor, CNC aluminium piston and cylinder head, 13:1 CNC steel high speed gears, 8mm ball bearing bushings and the EShooter Kestrel Basic MOSFET/ETU to keep everything running smoothly and add programmable fire controls into the mix. Also present is a 6.03mm Tightbore inner barrel, giving you above-average accuracy potential along with an air-efficiency advantage. If you're looking for a compact yet hefty CQB platform at the cutting edge of modern platform design, the CYMA CM.113B AKS-74U Zco Custom AEG; Kestrel Basic ETU is a fantastic choice!

Starting at the front, we cannot help but notice the seriously intimidating DTK-2 muzzle break, constructed from steel and finished in gun metal grey. This muzzle brake is a big boy, mounting to the pre-installed 24mm CW Russian thread adapter fitted to the 14mm CCW male threads on the outer barrel itself. When removing the DTK-2, you'll need to hold the detent in the front sight down before turning it and when removing the 24mm CW thread adapter you'll need to remove the grub screw on the bottom. This allows any 14mm CCW threaded suppressor or tracer to be mounted without the need for extra adapters, nice if you're going for a sneaky Spetsnaz look!

Following just behind, we have the gas block/front sight assembly, finished with a mock anti-corrosion style coating matching real Russian AKS-74U rifles perfectly.  The front sight can be adjusted for elevation using a front sight adjustment tool and is one of the few aspects of the iconic "Krinkov" silhouette that remains on this distinctive customised piece. On 

Surrounding the barrel and gas tube, we can find the handguard which is CNC machined from aluminium and patterned after the real steel Zco B11 handguard paired with a B19 railed upper handguard. The handguard is significantly weight-reduced in classic Zco style, with angled vent ports furnishing the build with a lean 'n' mean look. Up top, we're equipped with a skeletonised 20mm Picatinny rail ideally positioned for mounting a PEQ or DBAL laser, or a tactical flashlight. The 6 o'clock position also features a 20mm Picatinny rail with a fantastic replica of the Zco RK-5 vertical foregrip pre-installed. The RK-5 is the perfect grip for a Zco build but can be swapped out for your preferred vertical or angled grip at your discretion. 

On either side, we are equipped with Zco's unique negative space attachment slots, known as the "Basis" system. Basis works similarly to M-LOK, allowing you to directly mount Basis accessories or use 20mm Picatinny rail adapters. One short length of 20mm rail for the Basis system is included and pre-installed on the left side and can be removed or repositioned wherever you need it. 

Mounted around the original AKS-74U open rear sight, we are treated to a detailed replica of the real steel Zco B18 optics mount, providing a 20mm Picatinny rail which extends the full length of the rear sight housing. This rail is perfectly positioned to mount a micro red dot sight and you might even be able to squeeze a magnifier on as well, depending on your chosen mounting hardware. The B18 is removable for those who prefer to use the classic open sights, though these can still be used as backup with the B18 rail installed. 

The receiver itself follows the standard AK-47/74 format with a centrally positioned ambidextrous magazine release at the front of the trigger guard, a mock bolt carrier on the right side of the receiver and a 3-position fire selector on the right side. The fire selector provides 3 modes of fire; safe, full auto and semi-auto, in that order. It is an AK after all! This was designed in to allow for fast selection of semi-auto with a quick sweep down of the selector, and isn't actually because the AK was designed for full auto, as is the common myth. This selector is also an extended design, featuring a welded-on extension to allow you to switch modes with your trigger finger without removing your hand from the pistol grip along with a cutout designed to allow the bolt to be locked back on a real steel AK.

To access the HOP-up unit of the AKS-74U Zco Custom, simply hold the charging handle back to reveal the alloy slider adjustable HOP-up unit. The slider unit is known as one of the best designs out there and that is the reason this unit has not changed in design since the original Tokyo Marui AK-47 AEG. To increase the HOP-up effect, simply move the slider rearwards. Returning the slider to the front will reduce the HOP-up to its lowest setting.

On the bottom of the receiver, we come to the pistol grip; an enhanced design inspired by the real steel Zco RK-3 grip, complete with finger ridges and dot texture to improve traction. This grip is quite a bit wider than the real steel version to accommodate the AEG's motor but perfectly carries over the Zco aesthetic. The trigger guard/magazine release assembly is realistically constructed from stamped steel, offering a centrally positioned paddle mag release which is easily accessed for both left and right-handed shooters.

Thanks to its pre-installed EShooter Kestrel Basic MOSFET and highly upgraded internals, the AKS-74U Zco Custom is ready for an 11.1V LiPo straight out of the box, great news for high rate of fire fans! We recommend an 11.1V 1200mAh LiPo in AK stick configuration for a perfect fit and excellent performance. To install your battery, simply press the button at the rear of the receiver top cover, after which it can be hinged open, revealing a Deans battery connector inside. With your battery installed, simply return the top cover to its original position and pull the charging handle to engage the locking button if needed, taking care to avoid trapping the wiring.

Over on the left side of the receiver, we have several authentic looking mock rivets, all in the right place for a visually accurate AK replica. Between the mock rivets, we also have the old-school Russian AK side rail, just in case you want a more rearward mounting position for magnified optical sights. This side rail is compatible with Russian optics with the appropriate mounting apparatus or 20mm Picatinny rail mounted optics using an adapter, though some adapters may need the B-18 rear sight rail to be removed. 

Bringing up the rear, we are treated to what is probably the most adjustable rifle stock available, for the AK platform or otherwise! This stock is known as the Zco PT-1 and offers adjustable length of pull via the magnetic catch on the right side, adjustable cheek riser height via the bolts on the right side and an adjustable butt plate. Also present on the PT-1 is an ambidextrous sling bar for modern sling setups and an AK-style sling point on the right side for those who prefer an AK-style sling setup.

The adjustable butt plate allows you to set it up at the right height to suit your loadout and has been added in to allow the entire position of the stock to be raised, allowing for large night vision optics and thermal devices to be fitted and intuitively used. Like the old-school AK-74 side folder, the PT-1 can also be folded to the left side of the platform for storage or transportation using the button on the rear left of the receiver and returned to the deployed position by holding down the small silver tab on the underside of the hinge mechanism.

Inside the AKM Zco Custom, we are treated to the best internals CYMA currently has to offer. The gearbox shell is a version 3 design with reinforcements in all the key places, the gears are CNC steel 13.1 ratio high-speed examples and the motor is a neodymium magnet high torque motor, guaranteeing a speedy rate of fire which will have the enemy on the run!

The gearbox internals are also all upgraded, including a polycarbonate piston with a steel tooth rack, 8mm steel ball bearing bushings, a CNC aluminium ball bearing silent piston head, a ball bearing spring guide and a double O-ring equipped CNC aluminium silent cylinder head, promising smooth performance, flawless air seal qualities and enhanced durability to maintain reliability at high-performance parameters. The EShooter Kestrel Basic MOSFET is the icing on the cake, offering 6 levels of adjustable pre-cocking, options for 3 round burst and binary trigger along with low battery warning, cycle completion, active braking and low/high voltage cutoff.

Whether you're after a beast of a CQB platform in AK flavour or you skirmish fast and aggressively, seeking a platform to match, the CYMA AKS-74U Zco Custom will be an asset! With CYMA's super-speedy E-Edition internals, a fantastic quality full metal build and a modern external design which is sure to turn heads, you'll be in good hands with the CM.113B AKS-74U Zco Custom AEG; Kestrel Basic ETU at your side!

Features

  • Full metal construction - Mostly steel
  • 6.03mm Tightbore inner barrel - Improved accuracy potential
  • Zco Style DTK-2 muzzle brake pre-installed - A mega-menacing muzzle device!
  • 14mm CCW Male threaded barrel - Ready for a suppressor or alternative flash hider
  • 24mm CW Russian adapter pre-installed - Required for the original DTK-3 muzzle brake
  • Zco RK-5 Style vertical foregrip pre-installed - Mounts to 20mm Picatinny rails
  • Zco Style B11 20mm Picatinny railed lower handguard - Add a vertical grip, flashlight or bipod
  • "Basis" attachment slots at 3 & 9 o'clock - Fits "Basis" accessories, short 20mm Picatinny rail pre-installed
  • Zco Style B19 20mm Picatinny railed upper handguard  - Ready for a red dot sight or other 20mm accessories
  • AKS-74U open rear iron sight - Two aiming notches to choose from 
  • Zco Style B18 20mm Picatinny railed optics mount - Mount a micro red dot sight above the rear iron sight
  • Steel receiver - Realistically hefty and solid, a mix of real and mock rivets in all the right spots
  • Zco style RK-3 textured pistol grip - Dot texture on each side with finger ridges on the front
  • Extended fire selector lever - Switch fire modes with the trigger finger from a firing grip
  • Zco Style PT-1 adjustable folding stock - Plenty of adjustment positions, rubber butt plate & adjustable cheek riser
  • Adjustable butt plate height - Set the butt plate at a height which suits you via the screw on the right side
  • Kestrel Basic MOSFET/ETU functions:
    • Adjustable pre-cocking
    • Binary Trigger
    • 3-Round burst
    • Active braking
    • Low/high voltage cutoff
    • Low battery warning
  • Kestrel Basic MOSFET/ETU programming instructions available here
  • CYMA Platinum E-EDITION High Speed internals:
    • Reinforced Version 3 gearbox shell with quick change spring system
    • Polycarbonate piston with full steel tooth rack
    • CNC Machined steel 13:1 high speed gear set
    • 8mm Ball bearing bushings
    • CNC Aluminium silent ball bearing piston head
    • CNC Aluminium silent double O-ring cylinder head
    • Ball bearing quick change spring guide
    • High speed Neodymium magnet motor
    • Low resistance wiring
  • Rear wired: Deans/T-plug battery connector - Recommended battery: 11.1V 1200mAh LiPo AK Stick battery
  • Compatible with AK-47/74 AEG magazines - Spares are always available

Package Includes

  • CYMA CM.113B AKS-74U Zco Custom AEG; Kestrel Basic ETU
    • 130rnd Medium capacity magazine

Specification

General

Weapon Construction External
Weapon Type
Assault Rifle
Over 18 Only Icon
Over 18
Yes
Icon UKARA - United Kingdom Airsoft Retailer Association
Defence / UKARA Required
Yes, No,
FPS Icon
FPS (Feet Per Second), using 0.20g BB
Approx. 320fps ± 10%, using 0.20g BB
Site Legal Icon
Site Legal, using 0.20g BB
Yes
Screwdriver Icon
Pre-Built
Yes
Package
Included Items
  • Magazine
  • Speed Loader
Skill Level Icon
User Skill Level
Regular Player
Patrol Base - Warning Icon
Warnings
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. 3.15kg
Weapon Length Collapsed
Length (Collapsed)
47cm
Weapon Length Extended
Length (Extended)
77cm

Construction

Colour Wheel Greyscale
Primary Colour
Black
Construction Icon
Construction
Steel flash hider, gas tube, receiver, fire selector, trigger guard & trim. Alloy barrel, front sight, trunnion block & mock bolt. CNC alu handguard, stock tube & top cover. Polymer grip & cheek rest.
Weapon Construction External
External Construction
Polymer
Alloy
Stamped Steel
Aluminium
Gearbox Icon
Internal Construction
Polymer
Alloy
Aluminium
Steel

Weapon Specific

Power Source Icon
Powered By
Electric
Blowback Icon
Blowback
None
Weapon Platform
Assault Rifle, AK, AK Variant , AKS74U,
Magazine Style Icon
Magazine Style
Long Gun Magazine, Assault Rifle, AK Platform, 5.45 x 39mm 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
Right Handed
Weapon Configuration Icon
Weapon Configuration
Standard
Weapon Scale Icon
Weapon Scale
1:1
Suggested BB Weight
0.25g

Hop-Up

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

Furniture

Weapon Furniture Icon
Furniture
  • Zco Sport Handguard
  • Textured Pistol Grip
  • Adjustable Cheek Rest
  • Side folding retractable stock
  • Adjustable open iron sights
  • 20mm Railed Gas Block/Tube
  • DTK-2 Muzzle Brake
  • Extended fire selector lever
  • AK Hinged top cover
  • Rubber butt plate
  • Removable Proprietary Side 20mm rails
Rail System Icon
Rail System
20mm RIS / RAS , Pre-installed 20mm Picatinny rail sections, Zco Basis Attachment Slots,
Icon Stock Positions
Stock Setting
Sliding , Adjustable cheek riser, Skeleton side folding stock,
Sight Type Icon
Sight Type
Iron Sights
Sling Plate Icon
Sling Options
Buffer Plate , Loop ,

Barrel

Outer Barrel Length (in)
8.1''
Icon Thread Type
Outer Barrel Thread Type
Male
Icon Thread Direction
Outer Barrel Thread Direction
CCW (Counter Clockwise)
Outer Barrel Thread Size
14mm
Inner Barrel Diameter
6.03mm
Inner Barrel Length
275mm

Magazine Specific

Magazine Type
AEG, Medium Capacity ,
Magazine BB Capacity
Approx. 130 Rounds
Magazine BB Fill Method
Speed Loader
Magazine BB Fill Location
Top

Electric Gun Specific Information

Gearbox
Gearbox Icon
Gearbox Version
V3 Gearbox
Wiring Icon
Gearbox Wiring
Top Wired
Spring Change Icon
Gearbox Quick Change Spring
Yes
Digital Trigger Icon
Gearbox Electronic Trigger
Yes
Motor
Airsoft Motor Icon
Motor Type
High Speed
Battery Specific
Battery Connector
Patrol Base | Icon | Deans
Deans
Compatible Battery
Compatible Battery Type
Li-Po
Compatible Battery Configuration
AK Stick (Slim)
Compatible Battery Voltage
11.1v

Product Testing Data

Notepad Icon
Test Description
320 FPS +/- 10%
Notepad Icon
Tested Using
0.20g ASG Blaster BBs
Notepad Icon
Test Date
27/01/2025

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