Systema Value Kit 3-1 Ambidextrouse Gear Box Kit for PTW M4A1 / CQBR (for M90-M150 Cylinder)
Ambidextrous gear box design
Include Mini MOSFET (mini dean), 490 Kumi Motor, Selector, Switch Board, ECU (semi / full auto), line set plate
Suitable for Systema PTW M4A1 / CQBR (MAX2) Series Airsoft Rifle Airsoft Guns