SA-F04-RL FLEX™ BLDC™ Light Ops Stock, HAL ETU™ Gen. 2 - Pink

Specna Arms SA-F04-RL FLEX™ Gen.2 BLDC™ HAL ETU™ is a modern airsoft carbine designed for players who want fast response, low weight, and advanced internal parts without the need for an immediate upgrade. Right from the factory, it offers a combination of technologies that make it a very attractive choice for dynamic gameplay as well as regular weekend skirmishes.

The main advantage of this replica is the Specna Arms Dark Matter™ High Speed 27k BLDC™ brushless motor. Compared to conventional motors, it offers lower heat generation, quieter operation, higher efficiency, and instant trigger response. Thanks to the absence of brushes, there is no sparking, and the motor also provides a longer service life and stable performance even under high load. Another major benefit is the high torque available right from startup, allowing it to handle stronger springs without any loss of performance.

The firing control is managed by the HAL™ ETU, an electronic control unit using magnetic sensors and the Hall effect. This gives the player not only faster trigger response, but also a range of useful functions such as active brake, binary trigger, adjustable trigger sensitivity, pre-cocking, and programmable fire modes. A low battery warning and compatibility with brushless motors are, of course, also included.

Inside the rifle, you will also find new components that further enhance the overall performance. The rotary TDC Magnus™ Hop-Up chamber allows for very precise and stable hop adjustment, while the Helium™ Flat Hop bucking helps improve BB flight stability. Accuracy is further supported by the 6.03 mm precision inner barrel and the sealed aluminium nozzle, which contributes to better consistency.

Another major benefit is the reinforced Æther™ gearbox, which is ready for stronger springs up to M140. The design includes several practical features for servicing and tuning, such as inspection windows for pre-cocking and AoE, a reinforced front section, trigger adjustment capability, and a mainspring release function.

Externally, the model features lightweight nylon fibre-reinforced polymer, which helps reduce weight while maintaining good durability. The most stressed parts are made of metal, including the outer barrel, flash hider, fire selector, charging handle, magazine release, and QD sling points on the stock. A practical detail is also the functional bolt-catch and ambidextrous controls, which improve handling during gameplay.

The carbine is fitted with the minimalist Light Ops stock, which stands out with its low weight, modern design, and comfortable shoulder support. Rubberized elements improve cheek weld comfort and handling confidence.

Thanks to the ESA™ quick spring change system, you can easily adjust the power of the replica according to field limits or game type, without complicated disassembly or the need for special tools.

Specna Arms SA-F04-RL FLEX™ Gen.2 BLDC™ HAL ETU™ is an excellent choice for players looking for a modern, lightweight, and agile M4 platform with excellent electronics and a brushless motor already included from the factory.
It is ideal for those who want fast response, reliability, and performance without compromise.

Key Features

• BLDC™ Dark Matter™ High Speed 27k brushless motor
• HAL™ ETU with magnetic sensors
• TDC Magnus™ Hop-Up chamber for precise adjustment
• Helium™ Flat Hop bucking for more stable BB flight
• Reinforced Æther™ gearbox
• Ready for springs up to M140
• ESA™ quick spring change system
• 6.03 mm precision inner barrel
• Sealed aluminium nozzle
• 8 mm bearings and steel gears
• Ambidextrous controls
• Functional bolt-catch
• Lightweight nylon fibre-reinforced polymer construction
• M-LOK handguard
• Folding sights
• Light Ops stock

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Package Includes

• Specna Arms SA-F04-RL FLEX™ Gen.2 BLDC™ HAL ETU™ airsoft carbine
• 2× S-MAG Mid-Cap magazines
• Cleaning rod
• Allen key
• Small Tamiya – Deans adapter
• BB speedloader
• Additional M90 spring

Battery and charger are not included.