Beschreibung
The SA-F04 FLEX Gen.2 BLDC HAL ETU Half-Tan Airsoft rifle from Specna Arms is engineered for players who demand factory-level performance with room to tailor to their play style. Built around a high-torque BLDC motor, this carbine delivers immediate trigger response, reduced heat buildup, and longer service life thanks to a brushless transmission that minimizes wear and sparking even under rapid fire.
To maximize accuracy and consistency, the HAL ETU system integrates precise trigger sensing with programmable fire modes, automatic pre-cocking, and a low-battery alarm. This means you can push hard during skirmishes without worrying about reliability. The auto and semi modes are designed to cover a wide range of engagement scenarios—from controlled long-range shots to rapid close-quarters exchanges.
Explore the SA-F04 FLEX Gen.2’s core architecture:
- BLDC motor for sustained performance – no brushes means less wear, cooler operation, and higher efficiency at high speeds.
- HAL ETU control – magnetic trigger sensing, active brake, and a binary trigger option for decisive, programmable fire control (including auto, semi, 3-round burst, and 5-round burst).
- Top Down Center (TDC) Magnus Hop-Up chamber – unparalleled adjustment stability and precision in every shot (patented in Europe under 015052069-0001).
- Helium Flat Hop Eraser – improves backspin consistency and flight stability for tighter groupings at range.
- Æther Gearbox – reinforced frame with pre-cocking, AoE inspection windows, and spring compatibility up to M140 without sacrificing performance.
- Aluminium sealed nozzle – reliable seal and consistent air throughput under heavy use.
- Industrious build – nylon fibre-reinforced polymer body with critical metal components (flame suppressor, external barrel, bolt-catch, safety levers) for a balanced, durable platform.
- Ergonomic, ambidextrous design – enlarged selectors and magazine release for fast manipulation in any position.
- Light Ops Stock – compact, low-weight stock with non-slip cheek stickers and a curved rubber stock foot for shoulder stability.
- Factory readiness for upgrades – designed to accept a wide range of hard springs and aftermarket components without performance degradation.
Why the SA-F04 FLEX Gen.2 stands out
In the field, reliability and precision matter as much as raw firepower. The Gen.2 upgrades focus on repeatable accuracy, quick follow-up shots, and ease of maintenance. The combination of the BLDC motor, HAL ETU control, and the TDC Magnus Hop-Up creates a platform that remains stable across speeds and temperatures, making it a dependable choice for both tactical drills and intense skirmishes.
For users seeking to keep a low profile while maintaining high impact, the Half-Tan finish blends with urban environments and CQB setups, while the strong yet lightweight nylon-polymer chassis keeps the rifle maneuverable in tight spaces. The model’s notable materials mix—the majority nylon reinforced polymer with strategic metal parts—delivers a durable yet balanced feel in the hands, not a heavy, top-heavy build.
The AUTO function adds a practical edge: a controlled three-round burst precedes full-auto, giving you a predictable spread when you need it. The HAL ETU’s programmable semi/binary/AUG/sniper modes expand your options without requiring external tools, while the trigger-sensitivity adjustments (five levels) let you fine-tune response to your trigger pull.
Who this rifle is ideal for
- Players who want a high-performance, out-of-the-box platform that’s ready for precision upgrades and tune-ups.
- Players who value programmable fire control and ambidextrous ergonomics for fast-paced gameplay.
- Teams and individuals looking for a robust, field-tested platform with a proven gearbox and chamber design for long-term reliability.
- Fans of Specna Arms who seek the brand’s expertise applied to a versatile, competitively priced carbine.
Practical use cases and scenarios
- Urban CQB and close-quarters engagements benefit from the compact carbine profile, quick target transitions, and reliable trigger response.
- Mid-range field games are supported by stable hop-up via the TDC Magnus chamber, enabling consistent accuracy at practical distances.
- Layered loadouts can leverage the HAL ETU’s multiple modes for scenario-specific fire control—semi for stealth engagements, binary for decisive rushes, and triple/quad bursts for suppression.
Interested in more from the Specna Arms lineup? See more from the Specna Arms collection and explore related high-performance carbines in our Airsoft Rifles collection for options that align with your playstyle and budget.
Build quality, ergonomics, and maintenance tips
- The Hurried out-of-the-box experience is supported by reinforced frame design, which prevents frame flex under load and maintains consistent AoE alignment.
- Regular inspection of the TDC Magnus Hop-Up assembly ensures windage and elevation remain stable after extended use.
- Keep the nozzle and hop-up components clean to preserve the precision of the Helium Flat Hop Eraser and consistent BB backspin.
- Lubricate the gearbox and moving joints with light oil designed for airsoft to optimize response and reduce wear on the Æther shell components.
For additional options and compatible upgrades, the Specna Arms platform is designed with modularity in mind, allowing you to tailor torque, response, and trigger feel to your local field rules and style. The rifle is ideal for players who want a high-performance base that can evolve with their engagement strategies over time.
Ready to expand or customize your build? Explore the Specna Arms collection to compare variants and configurations that complement the SA-F04 FLEX Gen.2, then pair with compatible accessories and magazines to suit your preferred loadout.
|
Battery included
|
No
|
| Bearings diameter [mm] |
8
|
|
Blow Back
|
No
|
| Colour |
Half-Tan
|
| Product length [cm] |
75.50
|
| Product weight [g] |
2145
|
| Power supply |
Electric
|
| Material |
Aluminum
Plastic
|
|
Muzzle velocity [FPS]
|
390
|
| Fire mode |
Full-auto
Adjusted burst
Semi-auto
|
|
Gearbox version
|
Gearbox v2
|
|
Hop-Up
|
Yes
|
| Inner barrel length [mm]. |
230
|
| Length minimal [mm] |
670
|
| Magazine capacity [pcs.] |
125
|
| MOSFET/ETU |
Yes
|
| Quick Spring Change system |
Yes
|
| Type of plug |
DEANS / T-connect
|
| Type of thread on the barrel |
14mm CCW
|
SA-F04 FLEX Gen.2 BLDC HAL ETU Half-Tan Airsoft rifle Eigenschaften
Type: Assault Rifle
FPS: 400 (Joule: 1.49)
Powered by: Electric
Battery included: NO
In Germany, the Weapons Act governs the sale and use of Airsoft guns:
- Fully automatic Airsoft pistols with a muzzle energy up to 0.5 joules can be purchased by individuals 14 years of age or older. (please add our downgrade optional service for Germany).
- Handguns and rifles exceeding 0.5 joules must be semi-automatic (one shot per trigger pull) and require the buyer to be at least 18 years old. We'll ask for age verification during your online purchase.
- Age verification is done online before completing your order. If the recipient is different from the person placing the order, we'll also need their age verification.
- Carrying Airsoft guns in public is generally prohibited, even if they're not readily visible. Exceptions exist with a valid firearms license, but this only applies to handguns and semi-automatic rifles.
- Full Auto Airsoft guns exceeding 0.5 joules are considered firearms under the Weapons Act. Carrying them without a valid firearms license (with the "F in a pentagon" marking) is an administrative offense.
- Transporting Airsoft guns requires them to be unloaded, secured, and in a closed container.
- Using Airsoft guns is permitted on private property (with the owner's consent) and designated Airsoft fields.
Please ensure you comply with these regulations when purchasing and using Airsoft guns in Germany.
- Delivery time: 7 working days
- Processing time: Typically 48 hours (additional day for customs documentation)
- Shipping carrier: UPS
IMPORTANT: Airsoft Replica Purchase Requirements
- Valid defense: To purchase a Realistic Imitation Firearm (RIF), you must provide a valid defense.
Some valid defenses include:
- UKARA ID
- Membership in a reenactment company
- Museum curator status
- Membership in a television or film production team
- Two-tone service: Alternatively, if you can't provide a valide defense, you can request our two-tone coloring service, which allows you to purchase an airsoft replica without additional documentation.
Please note: Airsoftmania is not responsible for delivery problems due to missing defense documents.
For more information:
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- Our prices include VAT and duties.