ASCU-M249 Pro Mark II ETU

16 Years of Innovation – Trusted by Over 200,000 Players Worldwide

The ASCU-M249 Pro Mark II from Airsoft Systems represents the next step in advanced airsoft electronics — a high-end electronic gearbox management system designed specifically for M249 AEG replicas. Developed by the pioneers of airsoft ETUs and refined through over 16 years of field experience, this system delivers unmatched reliability, realism, and performance in even the most demanding conditions. 

Realism-Oriented Design Philosophy

• No Bluetooth. No apps. No gimmicks. Just authentic firearm behaviour.
• The ASCU-M249 Pro Mark II accurately replicates real trigger control, cycle timing, and selector operation, providing a lifelike and responsive shooting experience.
• Enforces complete gearbox cycles for true semi/full-auto realism and precise cutoff detection — ideal for MilSim and realism-focused players.
• Mechanical switches ensure maximum reliability and performance, even inside grease-filled gearboxes, unlike optical sensors that can fail under contamination.
• No external setup or apps needed — control and adjust everything through your trigger and selector, offering fast and intuitive mode changes in the field.

Core, Field-Proven Features

• Reliable Semi, Full-Auto, and Burst Fire Operation
• Programmable Trigger Modes for tailored performance
• Self-Adjusting Pre-Cocking for lightning-fast trigger response
• Precision Active Braking for improved control and motor longevity
• Accurate Gearbox Cycle Management ensures flawless operation
• Ultra-Fast Short Circuit Protection keeps both ASCU and motor safe
• Universal Battery Over-drain Protection extends battery life
• Maximum Input Voltage: 15V
• Maximum Burst Load: 240A
• Optimized for Brushless Motors, fully compatible with classic AEG motors

ASCU-M249 Pro Mark II – Realism. Reliability. Reinvented for Support Gunners.
Built to endure. Designed for precision. Perfected through experience — the ASCU-M249 Pro Mark II delivers professional-grade control and performance for your support weapon.

• https://airsoftsystems.com/manuals/ASCU-249-PROMk2-Manual-EN.pdf

• Gearbox Fit: Made specifically to fit inside proprietary M249 style gearboxes (unlike standard Version 2 layout variants).
• Note on Variants: If you have a newer "Featherweight" style M249 that utilizes a standard Version 2 layout, look into standard V2 units or drop-in units like the Aster II instead. Always double-check your specific M249 brand shell (e.g., A&K vs Classic Army vs Featherweight) before buying.