SA M4A1 RIS (SA-C03 CORE™ HAL ETU™) - 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 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 foundational design for the M4. In the 1980s, the first prototypes of the M4 appeared, featuring a shorter barrel and a telescopic stock, improving maneuverability in confined spaces.
In the 1990s, the M4 was officially adopted by the US armed forces as the standard carbine, replacing older models like the M3 and M9. The rifle is characterized by its ability to fire both semi-automatic and automatic, making it a versatile weapon.
The M4 quickly became popular among soldiers due to its light weight, compactness, and reliability. It was widely used in conflicts such as the Iraq and Afghanistan wars and has become an iconic weapon of modern US armed forces.
Besides the standard model, there are many variants of the M4 equipped with various accessories and enhancements to meet the specific needs of military units.
The airsoft AEG assault rifle M4 in the basic CORE™ series by Specna Arms emphasizes lightweight nylon body but also top-notch craftsmanship and fit. The body is reinforced with fiberglass and is more durable than common zinc alloy in cheap metal bodies, which will be appreciated by both beginners and advanced players who prefer fast action in the style of speedsoft, where every gram is just extra weight. This type of body is also found on weapons like the CZ Scorpion Evo or MP7.

What does the Specna Arms M4A1 RIS (SA-C03 CORE™ HAL ETU™) offer?

Internal Parts

The M4A1 RIS (SA-C03 CORE™ HAL ETU™) replica is equipped with the HAL ETU™ electronic processor unit, which takes the weapon's performance to a whole new level. This upgrade elevates Specna Arms from the mid-tier to the elite league of prestigious brands offering the latest technological features in the basic variants of their weapons. The name HAL is derived from the principle of the Hall effect, which allows the unit to detect trigger sensitivity.
Already in its base form, the M4 is equipped with a precise 6.03 mm barrel, which enhances accuracy, and an adjustable Hop-up chamber with a quality rubber. Additionally, a feature that is becoming increasingly common nowadays is the QSC system ESA (quick spring change), which allows you to install a stronger or weaker spring according to your preference. The spring can be changed without removing the gearbox from the weapon's body, everything is done easily through the buffer tube. The gearbox is also reinforced and is capable of working with springs up to M120 (as stated by the manufacturer Specna Arms).

The HAL ETU™ unit offers the following features:

• Trigger detection 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 firing modes (semi, binary, AUG, sniper with delay)
• Programmable AUTO firing modes (auto, semi, 3-round burst, 5-round burst)
• Easy programming via the trigger
• Low battery warning
• Compatible with brushless motors (such as the Specna Arms Dark Matter or Warhead)

External Parts

The Specna Arms M4A1 RIS (SA-C03 CORE™ HAL ETU™) replica stands out with high-quality external workmanship of the nylon body, which has a matte finish and looks very realistic. Thanks to the fiberglass reinforcement, it is also very durable and lightweight.
The external barrel is made of metal and screws, ejection port, and pins are even made of steel. The ergonomic design of the AR15 rifles and modern construction ensures comfortable handling and easy operation, this rifle just fits in your hand!
The CNC metal RIS handguard M4 allows attachment of various accessories like grip, AN/PEQ box, flashlight, etc. With an adjustable stock type Crane, this replica is ready for various gaming situations and allows battery insertion (type Buffer Stick, Nunchuck or Crane).
Overall, it is a rifle that combines great performance with an attractive price for maximum satisfaction of you, the players.

Key Features

• High-quality nylon body reinforced with polymer fibers
• Crane type stock for placing multi-part batteries
• V2 gearbox with QD system ESA quick spring change
• Reinforced polymer piston with all steel teeth
• Polymer nozzle
• Polymer cylinder head with seal and metal nozzle nose
• Polymer piston head with seal
• 8mm metal sliding bearings
• Set of gears with standard ratio 18:1
• Polymer rotary hop-up chamber
• Precise barrel with a diameter of 6.03 mm

Package Contents

• AEG rifle Specna Arms
• Hi-Cap magazine S-MAG for 380 BBs
• Foldable sight
• Grip
• Spare weaker spring (M90) for CQB
• Specna Arms promotional stickers
• User manual

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

Important first-use activation

To make the rifle fire, you must activate the HAL ETU and follow this procedure exactly—otherwise the rifle won’t respond to the battery:

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