Description
Specna Arms SA-F04-RL FLEX™ Light Ops Stock / HAL ETU™ Gen. 2 - Black
A lightweight and versatile AEG featuring programmable HAL™ ETU electronics, a reinforced Aether™ gearbox, Magnus™ TDC hop-up and an adjustable Light Ops stock.
The Specna Arms SA-F04-RL FLEX™ HAL ETU™ Gen. 2 is designed for players who want a lightweight, easy-to-handle and modern electric airsoft rifle. The factory-installed HAL™ ETU provides responsive trigger operation and versatile programming options without requiring an immediate aftermarket electronic upgrade.
The black nylon-reinforced polymer receiver and handguard keep the overall weight low, while metal load-bearing components provide rigidity in essential areas. The understated black finish suits a wide range of equipment configurations, while the compact Light Ops stock and approximately 650–750 mm adjustable overall length make the rifle suitable for both indoor environments and outdoor games.
HAL™ ETU Gen. 2
The factory-installed HAL™ ETU detects trigger movement using Hall-effect magnetic sensors instead of conventional mechanical trigger contacts. The system can be programmed directly through the trigger and offers extensive control over trigger sensitivity, pre-cocking and the functions assigned to the selector positions.
Programmable functions include active braking, binary trigger, five trigger-sensitivity levels, six pre-cocking levels and several selectable firing configurations for both the SEMI and AUTO positions.
HAL™ ETU functions
- Hall-effect magnetic trigger detection
- Active braking
- Binary trigger function
- Adjustable trigger sensitivity: five levels from 20% to 100%
- Adjustable pre-cocking: six levels
- AUTO-position programming: full auto, semi-auto, three-round burst or five-round burst
- SEMI-position programming: semi-auto, binary, AUG mode or sniper mode
- Trigger-based programming
- Low-battery warning
Reinforced Aether™ gearbox
The reinforced Aether™ Version 2 gearbox is designed for durability, straightforward maintenance and modern electronic operation. Its shell includes inspection openings for pre-cocking and angle-of-engagement checks, a spring-release function and an adjustable trigger-travel system.
The internal components include steel gears, a polycarbonate piston with steel teeth, a sealed aluminium nozzle and a steel cut-off lever. The gearbox uses a combination of 8 mm J-Cage ball bearings and 8 mm bushings in selected positions.
Aether™ gearbox components and features
- Reinforced Version 2 gearbox shell
- Spring-release function
- Pre-cocking and AoE inspection openings
- Adjustable trigger travel
- Sealed aluminium nozzle
- Steel gears
- Polycarbonate piston with steel teeth
- Steel cut-off lever
- 8 mm J-Cage ball bearings and bushings
- Factory-installed HAL™ ETU module
- Gearbox shell protected by European design registration 015044865-0001
Magnus™ TDC hop-up and Helium™ Flat Hop
The rotary-style Magnus™ TDC hop-up chamber applies pressure vertically and evenly to the hop-up rubber, helping produce stable and repeatable backspin. The chamber is protected by European design registration 015052069-0001.
The factory-installed Helium™ Flat Hop rubber is designed to provide effective spin with a broad range of BB weights, including heavier BBs. Together, the chamber and rubber provide a strong foundation for consistent range and accuracy.
ESA™ quick spring change
The ESA™ quick spring-change system allows the rifle’s power output to be adapted by replacing the main spring with only a few tools. An M90 spring and an M120 spring are included, with the M120 installed at the factory.
The listed performance is approximately 95 m/s and 0.90 J with the lower-power spring, or approximately 125 m/s and 1.6 J with the higher-power spring, measured using a 0.20 g BB. Actual output may vary between individual rifles, so the muzzle velocity must always be checked with a chronograph after changing the spring.
Lightweight FLEX™ construction
The receiver and handguard are made from nylon-reinforced polymer, reducing the overall weight without unnecessarily compromising rigidity. At approximately 2125 g, the rifle is comfortable to carry during longer games and quick to handle in confined spaces.
The 14 mm CCW muzzle thread allows compatible tracer units, suppressor replicas and alternative muzzle devices to be installed. The rifle uses a Deans / T-connector, and a Mini-Tamiya adapter is included in the package.
Features
- Lightweight FLEX™ Gen. 2 construction
- Black nylon-reinforced polymer receiver and handguard
- Compact and adjustable Light Ops stock
- Programmable HAL™ ETU Gen. 2
- Reinforced Aether™ Version 2 gearbox
- Magnus™ TDC rotary hop-up chamber
- Helium™ Flat Hop rubber
- ESA™ quick spring-change system
- Adjustable trigger sensitivity and pre-cocking
- Programmable semi-auto, full-auto, binary and burst functions
- 14 mm CCW muzzle thread
- Deans / T-connector
- Two S-MAG mid-cap magazines included
- No blowback system
Technical specifications
- Manufacturer: Specna Arms
- Model: SA-F04-RL FLEX™ HAL ETU™ Gen. 2
- Colour: black
- Product type: electric airsoft rifle / AEG
- Calibre: 6 mm airsoft BB
- Power source: electric
- Receiver and handguard material: nylon-reinforced polymer
- Gearbox: reinforced Aether™ Version 2
- Electronic trigger unit: HAL™ ETU Gen. 2
- Motor type: long
- Muzzle velocity: approximately 95 m/s or 125 m/s with a 0.20 g BB
- Muzzle energy: approximately 0.90 J or 1.6 J
- Hop-up: adjustable Magnus™ TDC
- Hop-up rubber: Helium™ Flat Hop
- Inner barrel length: 229 mm
- Overall length: approximately 650–750 mm
- Weight: approximately 2125 g
- Fire modes: programmable
- Blowback: no
- Muzzle thread: 14 mm CCW
- Battery connector: Deans / T-connector
- Recommended battery: compatible 7.4 V Deans battery
Package contents
- Specna Arms SA-F04-RL FLEX™ HAL ETU™ Gen. 2 AEG
- 2 x S-MAG 120-round mid-cap magazines
- BB speedloader
- Cleaning rod
- M90 spring
- M120 spring, factory installed
- Mini-Tamiya battery adapter
HAL™ trigger calibration before first use
- Set the fire selector to SAFE.
- Connect the battery.
- Wait approximately three seconds until the rifle emits a beep.
- Hold the trigger fully pressed for approximately five seconds until another beep is heard.
The second beep confirms that the trigger calibration has been completed successfully.
Manual:
HAL manual EN / PL
Note: Battery and charger are not included. A compatible battery with a Deans / T-connector and a suitable balance charger must be purchased separately.
