SA M4 CQB Keymod Gen2 Airsoft Rifle (SA-C08 CORE™ HAL ETU™) - Black / Tan

Specna Arms M4 CQB Keymod CORE™ Gen.2

The Specna Arms M4 CQB Keymod Gen2 (SA-C08 CORE™ HAL ETU™) replica stands out thanks to its high-quality external finish of the nylon body, which features a matte surface and delivers a very realistic look and feel. Thanks to reinforcement with fiberglass, the body is both lightweight and highly durable. The outer barrel is made of metal, while the screws, ejection port, and pins are even made of steel. The ergonomic AR15 design and modern construction ensure a comfortable grip and easy handling—this rifle simply feels right in your hands. The CNC metal Keymod handguard allows mounting various accessories such as a grip, AN/PEQ box, or flashlight. With the adjustable Crane-type stock, the rifle is ready for different game scenarios and allows the use of several battery types (Buffer Stick, Nunchuck, or Crane). Overall, this is a rifle that combines low weight, excellent internal components, and an attractive price.
Inside, the M4 CQB Keymod Gen2 (SA-C08 CORE™ HAL ETU™) is equipped with the HAL ETU™ electronic processor unit, which takes the rifle’s performance to a whole new level. With this upgrade, Specna Arms moves beyond the mid-range into the ranks of more premium brands offering cutting-edge technology as standard. The HAL name comes from the principle of the Hall effect, which allows the unit to precisely sense trigger input. It also increases the rate of fire and enables safe use of Li-Pol batteries 7.4V and 11.1V. The rifle also features a completely redesigned and reinforced gearbox designated ÆTHER, capable of handling AEG springs up to M140. Accuracy is ensured by a 6.03 mm precision inner barrel, paired with a Helium Flat-hop bucking installed in the redesigned MAGNUS™ chamber with a TDC pressure system. Also included is the ESA QSC quick spring change system, allowing you to install a stronger or weaker spring as needed. The spring can be changed without removing the gearbox from the body, simply through the buffer tube.

Detailed overview of CORE™ Gen2 AR15 replicas with internal components showcase

HAL ETU™ Electronic Unit Functions

• Trigger sensing based on magnetic sensors and the Hall effect
• Active brake
• Binary trigger (shot on pull and shot on release)
• Adjustable trigger sensitivity (5 levels from 20 to 100%)
• Adjustable pre-cocking (6 levels)
• Programmable SEMI modes (semi, binary, AUG, sniper with delay)
• Programmable AUTO modes (auto, semi, 3-round burst, 5-round burst)
• Easy programming via the trigger
• Low battery alarm
• Ready for use with brushless motors (e.g. Specna Arms Dark Matter or Warhead)

Technical Specifications

• Drive type: AEG
• Material: Nylon, metal, polymer
• Overall length: 655–740 mm
• Weight: 2265 g
• Muzzle velocity: 120 m/s (1.48 J)
• Inner barrel length: 230 mm
• Inner barrel diameter: 6.03 mm
• Hop-up: Adjustable, TDC
• Fire modes: Semi, Full Auto
• Barrel thread: 14 mm CCW
• Handguard: Keymod
• Recommended battery: 11.1V Li-Pol (not included)
• Connector: T-Dean
• Battery type: Crane (Buffer stick, Nunchuck)
• Magazine capacity: 125 BBs (Mid-Cap)
• Motor type: Brushed

Package Contents

• Specna Arms M4 CQB Keymod Gen2 AEG rifle
• 2× S-MAG magazines (125 BBs)
• Flip-up iron sights
• 2× RIS rails for Keymod
• 1× Keymod rail with QD sling adapter
• T-Dean to small Tamiya adapter
• Spare weaker spring (M90) for CQB
• Specna Arms promotional stickers
• User manual

Warning

• Springs from some manufacturers are significantly overrated (e.g. an M130 spring may equal M140–150 performance) and may exceed the declared gearbox durability. We recommend using only Specna Arms springs. When using springs from other manufacturers, choose M120 to avoid potential damage.
• When installing a progressive (irregular winding) spring, ensure the denser end is positioned on the spring guide facing outward from the gearbox.
• Never store the replica with the battery connected.

Commissioning the Replica

To fire the replica, the HAL ETU unit must be activated by following this exact procedure; otherwise the replica will not respond to a connected battery:

1. Set the fire selector to Safe.
2. Connect the battery and wait 3 seconds until you hear a beep.
3. Pull and hold the trigger for 5 seconds until you hear another beep.
4. The replica is now ready for use.