ETU System for TR166 MBR556WH Replicas
A special electronic unit made by a known and well-liked by players G&G. The ETU system is intended for the installation in G&G TR16 MBR556WH replicas equipped with gearbox G2.
The system enables programming following firing modes: semi / full-auto / 3-round burst. The system cuts off power if it detects too low voltage in the battery, thus prolonging its lifetime while a special sensor detects a complete cycle of gears rotation, which prevents double-fire in semi mode.