SA M4 CQB ETU (SA-B02 ONE™/ E-Shooter Kestrel) - Black

Assault Rifle M4

M4 is a compact automatic rifle developed in the United States based on the popular M16 assault rifle. It was designed with the need for a lighter and shorter version of the M16 in mind, suitable for use in close quarters and urban combat.
In the 1960s, the M16, developed by Armalite and adopted by the US military, was the basic design for the M4. In the 1980s, the first prototypes of the M4 appeared with a shorter barrel and a telescopic stock, improving maneuverability in confined spaces.
In the 1990s, the M4 was officially adopted into the US Armed Forces as the standard carbine, replacing older models such as the M3 and M9. The rifle features the capability to fire both single shots and bursts, making it a versatile weapon.
The M4 quickly became popular among soldiers due to its lightweight, compactness, and reliability. It was widely used in conflicts such as the Iraq and Afghanistan wars and became an iconic weapon of the modern US armed forces.
In addition to the standard model, there are many variants of the M4 equipped with different accessories and upgrades to meet the specific needs of military units.
The airsoft AEG assault rifle M4 series One™ from Specna Arms emphasizes top-notch metal body craftsmanship and premium CNC metal internal parts.
Compared to the Edge series, it differs in that the piston has only 1 metal tooth and the spring change system is different (more time-consuming).

What does the Specna Arms M4 CQB ETU (SA-B02 ONE™) offer?

Internal parts

The M4 CQB ETU (SA-B02 ONE™) replica is equipped with a processor unit E-Shooter Kestrel ETU. This ensures safe motor switching, protecting the internal parts, improving trigger response, extending battery life, increasing the weapon's rate of fire, and enabling the safe use of Li-Pol batteries 7.4V and 11.1V. Additionally, it allows you to set trigger sensitivity, pre-cocking, and various firing modes.
The weapon also features an adjustable Hop-up chamber with a high-quality rubber for excellent range.
It also includes the now-commonplace QSC quick spring change system Enter&Covert, allowing you to install a stronger/weaker spring as needed. The spring can only be replaced after removing the gearbox from the weapon's body (basic knowledge of disassembling external AEG parts such as the stock, pistol grip, etc., is required).
The gearbox is reinforced and includes premium internal parts (listed below), with the manufacturer stating the gearbox's durability up to a M120 spring.

The ETU Kestrel (Basic) processor unit offers:

• Simple setup:
  Easy setup in 3 simple steps using the trigger. Reset all functions by holding the trigger for 8 seconds.
  
  
• Pre-cocking:
  Kestrel offers 5 levels of pre-cocking for individual adjustment. The learning function automatically determines the piston position based on different speeds and loads. After reconnecting or disconnecting the battery, it fires one shot to calibrate.
  
  
• Brushless motor support:
  Compatible with brushless motors and high-speed/high-torque motors.
  
  
• Long lifespan:
  Maintains excellent performance even after more than 50,000 shots.
  
  
• Active brake:
  Adaptive function that stabilizes the gearbox, ensuring the piston stops in the optimal position, extending the life of the gearbox and internal parts.
  
  
• Rotor lock protection:
  Active protection that safeguards the gearbox from damage in case of motor malfunction.
  
  
• Low battery protection:
  The motor vibrates, and the blue light blinks 5 times when the battery is low.
  
  
• Low/high voltage protection:
  The unit automatically detects the number of lithium battery cells and supports different voltages from 6V for two-cell batteries up to 17V.

External parts

The Specna Arms M4 CQB ETU (SA-B02 ONE™) replica features high-quality external construction with a scratch-resistant finish. The weapon's body is matte coated, giving it an elegant look.
Ergonomic design of AR15 rifles and modern construction ensure comfortable handling and easy operation.
CNC metal RIS handguard M4 allows for the attachment of various accessories such as a grip, AN/PEQ box, flashlight, etc.
With an adjustable stock type Crane, this replica is ready for various gameplay situations and allows for battery insertion (types Buffer Stick, Nunchuck, or Crane).
Overall, this is a rifle that combines top performance with attractive design for maximum satisfaction for you, the players.
The external barrel features a classic 14-mm (CCW) thread, allowing the weapon to be equipped with a silencer, compensator, or a tracer unit.

Key Features

• High-quality metal body
• Crane stock for multi-piece battery placement
• gearbox V2 with QD system Enter & Covert
• QD metal spring guide with bearing
• Reinforced polymer piston with 1 metal tooth
• Aluminum nozzle
• Aluminum cylinder head with double sealing
• Aluminum piston head with sealing
• 8mm ball bearings for smooth operation
• Gear set with 18:1 ratio
• Polymer rotary hop-up chamber
• Processor unit ETU Kestrel V2 by E-Shooter

Package Contents

• Specna Arms AEG rifle
• Hi-Cap magazine (300 BBs)
• Spare weaker spring (M90) for CQB
• User manual

We can resolder the connector to a different one upon request. Just write your requirement in the order note.