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Specna Arms SA-F03 FLEX Light Ops Stock HAL ETU Gen.2 AEG Assault Carbine - Black

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€129.66
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€129.66

Specna Arms SA-F03 FLEX Light Ops Stock HAL ETU Gen.2 AEG Assault Carbine - Black

Electric assault carbine replica from the Flex series constructed from metal, steel, and high-strength polymer. Features the advanced HAL ETU electronic system, enabling users to tailor the replica's settings to their preferences, along with a quick change spring system ESA. Out of the box, the replica delivers a muzzle velocity of 390 FPS.

Solid construction, mounting rails

Constructed with a front end in the M-LOK system, receiver extension equipped with a Light Ops Stock, and a pistol grip, the body utilizes polymer reinforced with nylon fiber for enhanced durability. Components like the barrel, flash hider, enlarged charging handle, dummy forward assist, and control elements are crafted from aluminum and ZnAlu alloy. Steel construction is reserved for areas demanding additional strength, such as screws, pins, the ejection port window, QD sling mount on the stock, and the slide dummy. The receiver showcases unique markings and an individual serial number. In addition to the M-LOK system, RIS rails in the 22 mm standard on the upper surface and handguard facilitate the attachment of optics or other tactical accessories.

Precision barrel and hop-up chamber

Supplied in standard configuration, the replica features a rotating Hop-Up chamber TDC Magnus (Top Down Center) paired with a Helium Flat Hop bucking for consistent BB spin. A 6.03 mm precision barrel enhances shot accuracy. The external barrel is completed with a standard flash hider fitted on a 14 mm counter-clockwise thread, making it compatible with a sound suppressor as an alternative attachment.

Reinforced Aether Gearbox

At the heart of the replica lies a V2 gearbox, constructed on a reinforced Specna Arms Aether platform and outfitted with:

  • main spring quick-release mechanism
  • pre-cocking and AoE inspection ports
  • reinforced gearbox front
  • inspection windows for effortless shimming
  • adjustable trigger system
  • screw mounts for precise frame alignment
  • Fully compatible with M140 springs

Internally, premium-grade components include:

  • 8 mm bushings
  • steel gear set
  • hermetically sealed aluminum nozzle

HAL ETU module

The model incorporates a HAL ETU trigger control system, facilitating comprehensive control of the replica with straightforward function programming via the trigger and selector. Thanks to the HAL system, users benefit from a diverse array of functions designed for effortless customization to match individual shooter preferences, while ensuring optimal replica protection during operation, such as:

  • trigger recognition utilizing magnetic sensors and the Hall effect
  • active braking system
  • binary firing mode
  • customizable trigger sensitivity with 5 selectable levels ranging from 20% to 100%
  • adjustable pre-cocking in 6 incremental levels
  • programmable Auto fire modes, including Full Auto, Semi, 3-round Burst, and 5-round Burst
  • programmable Semi fire modes with options like Semi, Binary, AUG, and Sniper
  • simple function programming performed directly with the trigger
  • low battery warning indicator
  • compatible operation with brushless motors

ESA quick spring change system

Featuring an ESA quick spring change system, the carbine enables users to adjust power for various game environments without needing to disassemble the gearbox or use specialized tools. The replica comes equipped with a factory spring that delivers a muzzle velocity of 390 FPS, as well as an additional M90 spring.

Light Ops Stock

Outfitted with a lightweight Light Ops Stock featuring a sliding mechanism, the replica incorporates rubber, non-slip inserts on both sides of the cheek pad for enhanced stability when aiming. The recoil system is completed with a curved rubber pad on the buttstock, ensuring secure placement against the shoulder.

Set elements

  • Replica
  • S-Mag Hi-Cap magazine
  • Cleaning rod
  • Allen key
  • Small Tamiya to T-Deans adapter
  • Spare M90 spring

Main features

  • Constructed from nylon-reinforced polymer for enhanced durability
  • Equipped with a handguard featuring the M-LOK mounting system
  • Integrated HAL ETU control module
  • Features a reinforced Aether gearbox
  • Utilizes the ESA rapid spring change mechanism
  • Outfitted with a TDC Magnus Hop-Up chamber
  • Includes a Light Ops Stock for improved maneuverability
  • Comes with folding sight devices
  • Fitted with a 6.03 mm precision inner barrel
Specna Arms


Militaria.pl is a premium dealer of Specna Arms.


Specna Arms is a brand specialized in the production of ASG replicas, valued for their solid workmanship and value for money. The offered models are characterized by realistic appearance and high durability. The range includes a variety of series - from lightweight CORE™ models for beginners, through advanced EDGE™ models with metal bodies and licensed markings, to top PRIME™ replicas with brushless motors and modern electronics. The brand collaborates with renowned companies such as Rock River Arms and Daniel Defense. Specna Arms has a reputation among both beginners and advanced airsoft players.

More Information
Based on M4
Replica propulsion Electric
Muzzle velocity 390 fps
Accurate shot range Up to 40 m
Magazine type Hi-cap
Magazine capacity 300 6 mm caliber BBs
Gearbox Reinforced
Body Polymer
Overall length 805 mm
Weight 2200 g
Main color Black
Optics ready Yes
Fixed sighting devices Yes
Blowback No
Additional accessories included Yes
Accessory rail Yes
Hop-up Yes, adjustable
Plug type Deans/T-Connect
EAN 5902543215031
Manufacturer code SPE-01-048382
Brand Specna Arms

Reviews with photos

Review summary

Automatically prepared based on reviews

Number of reviews: 4

  1. r...
    100%

    A very well-made replica of an assault rifle, suitable for all kinds of skirmishes as well as target shooting. Good accuracy, does not jam. I recommend it.

  2. K...
    100%

    This assault rifle has an amazing range of 40m – for this price. It allows for quick spring change. It has electric power, which allows for continuous fire. All advantages. I recommend it.

  3. K...
    100%

    This carbine is extremely durable. I tried to cover it with sand and it still shoots. For this price, it's very good. I tested it in the forest and it looks nice.

  4. F...
    100%

    Very good. I recommend it, everything matches the description. It works great in tough conditions. Good finishing ensures high quality. The comfortable stock and grip guarantee comfort.

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