SA M4A1 RIS (SA-C03 CORE™ HAL ETU™) - Tan -

Internal Components
At the heart of this replica sits the HAL ETU™ electronic trigger unit — a genuine leap forward for Specna Arms, pushing what used to be a mid-range lineup firmly into the same performance bracket as the industry's top names. The "HAL" name comes from the Hall effect principle the unit relies on to read trigger input with exceptional precision.

Even before you factor in the electronics, the base platform is well specced: a 6.03 mm inner barrel for tightened accuracy, paired with an adjustable Hop-up chamber fitted with quality rubber. Spring swaps are handled through the ESA quick spring change (QSC) system, so you can move to a stiffer or softer spring without ever pulling the gearbox from the receiver — the whole job is done through the buffer tube. The gearbox itself is reinforced to handle springs rated up to M120, per Specna Arms' specifications.

What the HAL ETU™ unit brings to the table:

Hall-effect magnetic sensor for trigger detection
Active braking system
Binary trigger function (fires on both pull and release)
5-stage adjustable trigger sensitivity (20%–100%)
6-stage adjustable pre-cocking
Custom SEMI modes: semi, binary, AUG-style, delayed sniper
Custom AUTO modes: full-auto, semi, 3-round burst, 5-round burst
Trigger-based programming — no extra tools needed
Low battery alert
Brushless motor compatible (works well with units like the Specna Arms Dark Matter or Warhead)

Exterior Build
The nylon body is finished to a high standard — matte texture, realistic detailing, and fiberglass reinforcement that keeps it both tough and light in the hand. Metal shows up where it counts: the outer barrel, ejection port, and pins are all steel or machined metal, not plastic substitutes.

Built on the familiar AR15 ergonomic platform, the layout feels intuitive from the first grip — controls fall naturally under your fingers and the balance suits fast handling. A CNC-machined metal RIS handguard gives you rail space for grips, AN/PEQ boxes, flashlights, and other accessories, while the Crane-style adjustable stock accepts Buffer Stick, Nunchuck, or Crane battery types, keeping you flexible for different loadout setups.

A replica that punches well above its price point, blending serious internal tech with a durable, field-ready exterior.