The MCU wire harness is intended for use with REV3 FCU's that feature the built in MCU (Motor Control Unit) for running the replica's box magazine. This model is intended for custom wiring and is equipped with the ZH series connector at one end which attaches to your FCU while the other end is left bear for soldering or splicing into your magazine motor or existing wire harness.
FOR USE WITH GEL BLASTERS
The information above is provided by the manufacturer and may not be relevant to the use of this product in gel blaster set ups .