ARES Electronic Circuit Unit ETU for M4 Rear Wire (ARES-EFCS-002)

The ARES Electronic Circuit Unit (ETU) for M4 Rear Wire (ARES-EFCS-002) is a factory replacement electronic fire control system designed for ARES M4 AEG platforms using rear-wired Version 2 gearboxes. It serves as the core electronic control unit, managing trigger response, firing modes, and overall gearbox efficiency for smooth and reliable operation.

Built to ARES EFCS specifications, this unit uses advanced sensor-based technology to improve trigger response and cycling consistency compared to traditional mechanical trigger contacts. It helps reduce wear on internal components by minimising electrical arcing, while also improving battery efficiency and overall system reliability.

Designed as a direct replacement for compatible ARES M4 series rifles, the ETU is ideal for repairing damaged units or restoring original factory performance. When installed correctly, it delivers crisp trigger response and stable semi and full-auto operation for consistent on-field performance.

Key Features:
• Genuine ARES EFCS/ETU replacement unit (ARES-EFCS-002)
• Designed for rear-wired M4 AEG platforms
• Electronic fire control system for improved trigger response
• Reduces wear on mechanical trigger contacts
• Enhances battery efficiency and electrical reliability
• Supports consistent semi and full-auto operation
• Factory-spec replacement for compatible ARES gearboxes
• Ideal for repairs, maintenance, and restoration builds