ARES E.F.C.S. Metal Complete Rear Gearbox Set For Ares (Ameoba) M4 AEG Airsoft (One-Piece Cylinder)

Key Feature Electronic Firing Control System (E.F.C.S) Rear Wire Complete Gear Box Set Upgraded Version Reinforced Metal Gear Box Housing Reinforced full teeth piston, gearbox shell, and an upgraded EFCS which is ARES's MOSFET system allow to shoot in either, Semi / Burst, Burst / Full Auto, or Semi / Semi as well. Version 2 gearbox, will fit in MOST brand M4 AEG as all gearboxes are relatively the same shape and size Some G&P and VFC bodies change depending on the model so there may be need for some modifications *For you to alter the fire selecting mode, you will also need to purchase the ARES Electronic Firing Control System.