ETU system for TR166 MBR556WH replicas

ETU system for TR166 MBR556WH replicas

A special electronic device manufactured by a well-known company called G&G that is popular with players. The ETU system is equipped for installation in G&G TR16 MBR556WH replicas with G2 gearbox. 

The system allows the following firing modes to be programmed: semi-automatic / fully automatic / 3-shot burst. The system cuts power when it detects low battery voltage to prolong battery life, while a special sensor detects a full cycle of gear rotation, preventing double firing in semi-mode.