Description
Specna Arms SA-J81 CORE™ HAL ETU Gen. 2 - Black
The Specna Arms SA-J81 CORE™ HAL ETU Gen. 2 is a compact AK-style AEG equipped with programmable HAL™ electronics, a Magnus™ TDC hop-up chamber, upgraded CORE™ Gen. 2 internals and a quick-change spring system.
The SA-J81 belongs to the redesigned Specna Arms J-Series™ CORE™ Gen. 2 range, which combines an accessible price point with modern internal components and practical adjustment options. Its relatively short 725 mm construction and approximately 2,625 g weight make it easy to handle in woodland games, urban environments and tighter playing areas.
The nylon-fibre-reinforced polymer construction keeps the rifle manageable, while steel and metal-alloy components reinforce areas exposed to greater mechanical stress. A side-folding stock reduces the space required during transport and helps when operating in confined spaces.
Programmable HAL™ ETU
The HAL™ electronic trigger unit detects trigger movement using magnetic Hall-effect sensors instead of a conventional mechanical trigger switch. Trigger response, pre-cocking and fire-selector functions can be programmed directly through the trigger without opening the rifle or using a separate application.
- Adjustable trigger sensitivity: five levels from 20 to 100%
- Adjustable pre-cocking: six levels
- Active Brake
- Binary trigger mode
- Programmable AUTO selector modes: full auto, semi-automatic, three-round burst or five-round burst
- Programmable SEMI selector modes: semi-automatic, binary, AUG or sniper mode
- Easy programming through the trigger
- Low-battery warning
In the HAL™ AUG mode, the rifle fires an initial three-round burst and continues in full auto if the trigger remains pressed.
This is the standard HAL™ ETU version with a conventional motor, not a separate BLDC model equipped with a brushless motor.
Updated CORE™ Gen. 2 internals
The internal mechanism is built around a Version 3 gearbox with 8 mm bearings and 16:1 steel gears. The compression system includes an aluminium cylinder, sealed polymer piston and cylinder heads, a sealed aluminium nozzle and a piston with a 14.5-tooth steel rack.
- Version 3 gearbox
- 8 mm bearings
- 16:1 steel gears
- Piston with a 14.5-tooth steel rack
- Sealed polymer piston head
- Sealed polymer cylinder head
- Aluminium cylinder
- Sealed aluminium nozzle
- 6.03 mm brass precision inner barrel
Magnus™ TDC hop-up chamber
The rotary Magnus™ TDC hop-up chamber applies pressure directly from above, allowing precise and stable adjustment. It is paired with a 300 mm long, 6.03 mm brass inner barrel to support a consistent BB trajectory in the factory configuration.
Quick-change spring system
The quick-change spring system allows the mainspring to be replaced without completely disassembling the gearbox. This makes it easier to adapt the muzzle velocity to different field limits and styles of play.
The advertised muzzle velocity of the standard configuration is approximately 116 m/s or 380 FPS. An additional M90 spring is included for reducing the output when required.
Lightweight AK-style construction
The receiver and several external components are made from durable nylon-fibre-reinforced polymer. Selected structural parts, including components of the barrel assembly, sight blocks, handguard retainers and muzzle device, are made from aluminium and zinc alloy.
The top cover, fire selector and trigger guard are made from steel. The rifle also features a side-folding stock and an AK-style dovetail side rail for installing a compatible optic mount.
The battery compartment is located underneath the top cover and provides space for a stick-type LiPo or Li-Ion battery. The rifle uses a DEANS / T-connect battery connector, and a Small Tamiya to DEANS adapter is included.
Magazine compatibility
The rifle is compatible with many AK-style magazines. Magazines from Cyma, JG, E&L and Bolt generally fit without modification, while magazines from other manufacturers may require minor fitting.
Features
- Compact AK-style J-Series™ CORE™ Gen. 2 construction
- Programmable HAL™ electronic trigger unit
- Magnetic Hall-effect trigger detection
- Adjustable trigger sensitivity and pre-cocking
- Active Brake and binary trigger functions
- Programmable semi-automatic, full-auto and burst modes
- Version 3 gearbox
- 8 mm bearings and 16:1 steel gears
- Magnus™ rotary TDC hop-up chamber
- 300 mm long, 6.03 mm brass precision inner barrel
- Sealed aluminium nozzle
- Quick-change spring system
- Nylon-fibre-reinforced polymer receiver
- Steel top cover, fire selector and trigger guard
- Side-folding stock
- AK-style dovetail side rail
- DEANS / T-connect battery connector
Technical specifications
- Manufacturer: Specna Arms
- Model: SA-J81 CORE™ HAL ETU Gen. 2
- Product type: electric airsoft rifle
- Operating system: AEG
- Gearbox: Version 3
- Electronic trigger unit: HAL™ ETU
- Motor version: conventional motor, not BLDC
- Fire modes: semi-automatic, full auto and programmable burst modes
- Muzzle velocity: approximately 116 m/s / 380 FPS
- Hop-up: adjustable Magnus™ TDC rotary chamber
- Inner barrel diameter: 6.03 mm
- Inner barrel material: brass
- Inner barrel length: 300 mm
- Gear ratio: 16:1
- Bearing diameter: 8 mm
- Overall length: approximately 725 mm
- Weight: approximately 2,625 g
- Battery connector: DEANS / T-connect
- Battery compartment: underneath the top cover
- Recommended battery shape: stick-type
- Muzzle thread: 14 mm CCW
- Main materials: nylon-fibre-reinforced polymer, aluminium, zinc alloy and steel
- Colour: Black
Package contents
- Specna Arms SA-J81 CORE™ HAL ETU Gen. 2 AEG
- 2 × S-MAG mid-cap magazine
- Additional M90 spring
- Small Tamiya to DEANS adapter
- Cleaning rod
Activating the HAL™ trigger before first use
The HAL™ trigger must be activated when the battery is connected for the first time:
- Set the fire selector to SAFE.
- Connect the battery to the rifle.
- Wait approximately three seconds until the system emits a beep.
- Press and hold the trigger fully for approximately five seconds.
- Release the trigger after the confirmation beep.
Note: The battery and charger are not included.
