SA-J04 EDGE HAL ETU airsoft rifle with Magnus TDC chamber

Specna Arms SA-J04 EDGE HAL™ ETU Airsoft Carbine with Magnus TDC Chamber

The SA-J04 EDGE™ HAL™ ETU is a high-performance airsoft carbine designed for milsim readiness, CQB efficiency, and field reliability. Built by Specna Arms, this model blends rugged external craftsmanship with advanced internal electronics to deliver outstanding consistency, tuning ease, and real-world performance straight out of the box. For those who value precision and versatility, this platform stands among the best in the airsoft rifles category and the Evolution Airsoft lineup.

Key Features

• HAL™ ETU control module with trigger detection based on magnetic sensors and Hall effect, providing an active brake, binary trigger, adjustable trigger sensitivity (5 levels from 20% to 100%), adjustable pre-cocking (6 levels), and programmable AUTO and SEMI firing modes. Easy programming via the trigger and a low battery alarm ensure you stay in control on the field.
• Magnus TDC Rotary Hop-Up chamber (Top Down Center) for improved consistency and precision across the full FPS spectrum. This upgrade helps you maintain tight groupings at all engagement distances.
• EDGE™ series durability with a sheet steel body and a largely steel construction for the barrel, breech cover, external barrel, magazine catch, selector wing, stock eyelets, and other critical components. Aluminum is used for precision parts such as sights, dovetail mount, reload handle, and discharge device, while the stock and pistol grip use durable polymer.
• ORION™ V3 Gearbox tuned for excellent stock operation and ready for tuning to high-power springs (compatible with M140). The gearbox is designed for long life, easy maintenance, and future upgrades.
• ESA2 Quick-Change Spring System for rapid tuning to field rules or power limits without disassembly.
• LiPo-ready design with generous space under the breech cover for a stick-type battery; battery space is LiPo-friendly and ship-ready for serious field use.
• Extensive internal components include a polymer piston with a full steel jaw, double-sealed aluminum cylinder head, aluminum sealed nozzle, polymer sealed piston head, and a polymer bearing spring guide, delivering reliability and smooth cycling under stress.
• Rigorous exterior details feature a fixed, robust sighting lineup and a side-dovetail mounting rail, providing ample room for accessories while maintaining a slim profile.
• In-the-box readiness includes 2x mid-cap S-MAG magazines, cleaning rod, replica, Allen key, small Tamiya–Deans adapter, BBs speedloader, and an M90 additional spring. Note: the set excludes the battery and charger.
• Airsoft rifles that balance out-of-the-box performance with tunable internals make this a strong choice for serious players seeking reliability and upgrade potential.

Real-World Performance

In the field, the SA-J04 EDGE HAL ETU excels in both dynamic CQB engagements and longer-range milsim scenarios. The Magnus TDC Hop-Up provides tighter shot groups at varying ranges, while the HAL ETU enables precise control over auto and semi modes, including configurable bursts. The quick-change spring system lets you adapt the platform to different local power limits or game formats without downtime, keeping you ready for the next encounter.

Build Quality and Tuning

Specna Arms’ EDGE line emphasizes external workmanship and reliability. The combination of steel components and lightweight aluminum and polymer touches results in a sturdy, durable replica that can stand up to field use and heat from prolonged firefights. Inside, the ORION™ V3 gearbox is designed for solid stock operation and is prepared for M140-level tuning, providing enthusiasts with a clear upgrade path. For those who enjoy tuning, the HAL ETU and ESA2 system offer a wide range of programmable options to tailor the replica to your playstyle.

What’s Included

• 2x mid-cap S-MAG magazines
• Cleaning rod
• Replica
• Allen key
• Small Tamiya – Deans adapter
• BBs speedloader
• M90 additional spring

What’s Not Included

The battery and charger are not included. The design is LiPo-ready with space under the breech cover for a stick-type battery, enabling quick setup for field play. For power and charging options, consider our batteries and chargers collection to find compatible LiPo packs.

Brand and Collection

Specna Arms is renowned for delivering robust, tuner-friendly replicas that balance performance and value. For more from this trusted family, explore related products in the Evolution Airsoft range and our broader lineup of airsoft rifles in Airsoft Rifles.

Specifications