SA M4 Keymod Gen2 Airsoft Rifle (SA-C09 CORE™ HAL ETU™) - Black

Specna Arms M4 Keymod CORE™ Gen.2

The Specna Arms M4 Keymod Gen2 (SA-C09 CORE™ HAL ETU™) replica stands out with its high-quality external finish of the nylon body, featuring a matte look and a very realistic feel. Thanks to fiberglass reinforcement, the body is highly durable while remaining lightweight. The outer barrel is made of metal, while screws, the 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 attachment of accessories such as a grip, AN/PEQ box, or flashlight. With the adjustable Crane-type stock, the rifle is ready for various game scenarios and allows the use of batteries (types Buffer Stick, Nunchuck, or Crane). Overall, this rifle combines low weight, excellent internals, and an attractive price.
Inside, the M4 Keymod Gen2 (SA-C09 CORE™ HAL ETU™) is equipped with the HAL ETU™ electronic processor unit, which pushes the rifle’s performance to a whole new level. With this upgrade, Specna Arms moves from the mid-range segment into the league of more prestigious brands offering the latest technological features as standard. The name HAL is derived from the principle of the Hall effect, allowing the unit to precisely sense trigger movement. 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 reinforced gearbox designated ÆTHER, capable of handling AEG springs up to M140. Accuracy is ensured by a 6.03 mm inner barrel, paired with a Helium Flat-hop bucking 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 without removing the gearbox from the receiver—everything is done easily through the buffer tube.

Detailed presentation of AR15-type CORE™ Gen2 rifles with a look at the internal parts

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 delay)
• Programmable AUTO modes (auto, semi, 3-round burst, 5-round burst)
• Easy programming via trigger
• Low battery alarm
• Ready for use with brushless motors (e.g. Specna Arms Dark Matter or Warhead)

Technical Specifications

• Power type: AEG
• Material: Nylon, metal, polymer
• Overall length: 795–880 mm
• Weight: 2415 g
• Muzzle velocity: 120 m/s (1.48 J)
• Inner barrel length: 375 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 Keymod Gen2 AEG rifle
• 2× S-MAG magazines (125 BBs)
• Folding iron sights
• 3× RIS rails for Keymod
• T-Dean to small Tamiya adapter
• Spare weaker spring (M90) for CQB
• Specna Arms stickers
• User manual

Warning

• Some manufacturers’ springs are overrated (e.g. M130 may equal M140–150). Use Specna Arms springs only, or choose M120 springs from other brands.
• When installing progressive springs, ensure the tighter coils face outward from the gearbox.
• Never store the replica with the battery connected.

Initial Setup

To start using the rifle, 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 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 another beep sounds.
4. The replica is now ready for use.