SA M4 CQB M-LOK (SA-F08 FLEX™ HAL ETU™) - Black

Assault Rifle M4

The M4 is a compact automatic rifle developed in the United States based on the popular M16 assault rifle. It was designed to be a lighter, shorter version of the M16 suited for close-quarters and urban combat.
In the 1960s, the M16, developed by Armalite and adopted by the US military, served as the foundational design for the M4. In the 1980s, the first M4 prototypes emerged, featuring a shorter barrel and telescoping stock, enhancing maneuverability in tight spaces.
In the 1990s, the M4 was officially adopted by the US military as a standard carbine, replacing older models like the M3 and M9. The rifle is versatile, capable of both single-shot and burst fire modes.
The M4 quickly gained popularity among soldiers due to its light weight, compactness, and reliability, widely used in conflicts such as the Iraq and Afghanistan wars and becoming iconic in modern US armed forces.
Beyond the standard model, numerous M4 variants exist, each equipped with accessories and enhancements to meet specific military requirements.
The airsoft AEG M4 assault rifle in the FLEX™ series by Specna Arms emphasizes lightweight nylon construction with superior finish and alignment. The body is reinforced with glass fibers, making it more durable than standard zinc alloy bodies found in cheaper metal versions, ideal for both beginners and advanced players who prefer speedsoft-style rapid action where every gram counts. This type of body is also seen in guns like the CZ Scorpion Evo and MP7.
The FLEX series is essentially a sibling to the CORE series, where CORE features a CNC metal handguard, while FLEX comes with a nylon handguard. The internal components are identical to those in the CORE series.

Features of Specna Arms M4 CQB M-LOK (SA-F08 FLEX™ HAL ETU™)

Internal Parts

The M4 CQB M-LOK (SA-F08 FLEX™ HAL ETU™) replica is equipped with the HAL ETU™ processor unit which enhances the weapon's performance to a new level. This upgrade elevates Specna Arms from the mid-range into a higher tier, alongside brands that offer the latest technology in their entry-level models.
HAL is based on the Hall effect, enabling sensitivity detection of the trigger.
The M4 comes with a 6.03 mm precision barrel to increase accuracy and an adjustable Hop-up chamber with a quality rubber seal.
Another frequent feature today is the ESA QSC quick spring change system, allowing for easy installation of stronger or weaker springs according to preference. Springs can be swapped without removing the gearbox, accessible through the stock tube.
The gearbox is reinforced and designed to work with springs up to M120 (as per Specna Arms).

HAL ETU™ Features:

• Trigger sensing based on magnetic sensors and Hall effect
• Active brake
• Binary trigger (fires upon both pulling and releasing the trigger)
• Adjustable trigger sensitivity (5 levels from 20 to 100%)
• Pre-cocking settings (6 levels)
• Programmable SEMI firing modes (single, binary, AUG, sniper with delay)
• Programmable AUTO firing modes (auto, single, 3-round burst, 5-round burst)
• Simple programming via trigger
• Low battery alert
• Prepared for use with brushless motors (e.g., Specna Arms Dark Matter or Warhead)

Important instructions for weapon activation

To start shooting, the HAL ETU unit must be activated by following this procedure exactly, otherwise the weapon will not respond to the connected battery:

1. Switch the selector to Safe.
2. Connect the battery and wait for 3 seconds until a beep sounds.
3. Pull the trigger and hold it for 5 seconds until another beep sounds.
4. The weapon is now ready for use.

External Parts

The Specna Arms M4 CQB M-LOK (SA-F08 FLEX™ HAL ETU™) replica stands out with high-quality nylon body construction that has a matte finish for a realistic look. The body is reinforced with glass fibers, making it both durable and lightweight.
The outer barrel is metal, and parts like screws, ejection port cover, and pins are steel.
The ergonomic AR15 design and modern construction ensure a comfortable grip and easy handling.
The nylon M-LOK handguard on the M4 allows for various attachments such as grip, AN/PEQ box, flashlight etc.
With an adjustable Crane-style stock, this replica is ready for diverse gameplay situations and compatible with different battery types (Buffer Stick, Nunchuck, or Crane). Overall, this rifle combines a lightweight design with high-quality internals at an attractive price.

FLEX series plastic parts:

• Body
• Stock tube
• Handguard
• Grip, stock, and sights as in the Edge series

Metal parts:

• Outer barrel with 14mm- thread for a suppressor
• Flash suppressor
• Charging handle for hop-up access
• Screws, pins, and small body parts are steel

Key Features

• High-quality nylon body reinforced with polymer fibers
• Programmable HAL ETU™ processor unit with T-DEAN connector in the stock
• Crane stock for multi-section batteries
• V2 gearbox with QD ESA quick spring change system
• Reinforced polymer piston with full metal teeth
• Polymer nozzle
• Polymer cylinder head with sealing and metal nozzle
• Polymer piston head with sealing
• 8mm metal bushings
• Standard 18:1 gear set
• Polymer rotary hop-up chamber
• 6.03mm precision barrel

Package Contents

• Specna Arms AEG rifle
• High-capacity (Hi-Cap) S-MAG magazine with 380 BBs
• Flip-up sights
• Spare weaker spring (M90) for CQB
• Specna Arms stickers
• User manual