Specna Arms SA-F04 Flex Gen. 2 BLDC HAL ETU AEG Assault Carbine - Half-Tan

The SA-F04 carbine electric replica from the Flex Gen. 2 BLDC series is constructed from nylon fiber-reinforced polymer with metal components. The model integrates a HAL ETU control module for customizable user settings, a Specna Arms Dark Matter High Speed 27-35k brushless motor, and the ESA quick spring change system. Featuring a compact, ergonomic build, the replica is perfectly suited for CQB skirmishes as well as close to medium range operations.

The receiver, front section in the M-LOK system, Light Ops Stock with integrated handguard, and pistol grip are constructed from polymer reinforced with nylon fiber. Components including the flash hider, outer barrel, dummy bolt carrier, ejection port cover, fire selector lever, bolt release button, magazine catch, QD stock mounts, pins, and charging handle are crafted from metal. Markings and an individual serial number are present on the body’s surface. Alongside the M-LOK slots located on the upper and front handguard, there are 22 mm RIS rails installed, providing mounting options for optics and additional accessories.

Ambidextrous and enlarged controls (selector and magazine release) are featured on the model, along with a bolt-catch mechanism.

Outfitted from the factory, the replica features a rotary hop-up chamber TDC Magnus (Top Down Center) paired with a Helium Flat Hop bucking, delivering consistent BB rotation. An integrated 6.03 mm precision barrel enhances shot accuracy. The outer barrel comes equipped with a standard flash hider on a 14 mm counter-clockwise thread, making it compatible with a sound suppressor attachment.

At the heart of the replica lies a V2 gearbox built upon the reinforced Specna Arms Aether framework, featuring:

• main spring quick-release mechanism
• inspection ports designed for pre-cocking adjustments and AoE optimization
• reinforced front section
• additional inspection windows to facilitate easier shimming
• integrated trigger adjustment capability
• pre-drilled mounting screw holes for precise framework alignment
• full compatibility with M140 springs

The internal build further includes high-quality components such as:

• 8mm slide bearings
• hardened steel gear set
• durable polycarbonate piston with a full-length steel rack

The replica features an advanced HAL ETU trigger control system, supporting smooth operation and offering convenient programming of various functions through the trigger and selector. The HAL system delivers multiple options for straightforward customization to match shooter preferences and enhance operational safety, such as:

• Trigger detection utilizing magnetic sensors and the Hall effect
• Active braking system
• Binary trigger capability
• Customizable trigger sensitivity with 5 incremental levels ranging from 20% to 100%
• Adjustable pre-cocking in 6 different settings
• Programmable Auto fire modes, including Full Auto, Semi, 3-round Burst, and 5-round Burst
• Programmable Semi firing modes: Semi, Binary, AUG, and Sniper
• User-friendly programming via the trigger
• Low battery warning alert
• Compatible with brushless motors

The replica comes equipped from the factory with a high-performance brushless BLDC (Brush Less Direct Current) motor Specna Arms Dark Matter High Speed 27-35k, delivering increased power, enhanced rate of fire, superior reliability, and optimized efficiency. Engineered to operate with very strong springs (up to M190), the motor provides high torque (approximately 27,000-35,000 RPM).

Key attributes of the BLDC Specna Arms Dark Matter High Speed 27-35k brushless motor include:

• elimination of sparking
• extended service life (absence of consumable components)
• consistent performance at elevated RPM
• exceptional energy efficiency
• whisper-quiet operation
• reduced heat output
• immediate trigger response
• high torque available from startup
• compatibility with heavy-duty springs without compromising efficiency or RPM

Equipped with the ESA quick spring change system, the carbine enables rapid power adjustment to suit varying game scenarios, all without needing to dismantle the gearbox or employ specialized tools. Supplied in the set are a factory spring that delivers an initial muzzle velocity of 390 FPS, along with an additional M90 spring.

Featuring a lightweight, adjustable Light Ops Stock, the replica enhances operational adaptability. Rubber, non-slip inserts on both sides of the cheek pad offer improved aiming stability. A curved rubber pad on the buttstock delivers a secure and comfortable shoulder fit.

• replica
• 2 x S-MAG mid-cap magazines
• cleaning rod
• hex key
• adapter from small Tamiya to T-Deans
• BB speedloader
• spare M90 spring

• Constructed from a nylon-reinforced polymer body
• Handguard featuring the M-LOK system with supplementary RIS rails
• Equipped with HAL ETU module
• Enhanced Aether reinforced gearbox
• Features the ESA quick spring change system
• Driven by a brushless Specna Arms Dark Matter High Speed 27–35k motor
• Integrated TDC Magnus hop-up chamber
• Fitted with a Light Ops Stock
• Includes folding sighting devices
• Outfitted with a 6.03 mm precision barrel