G&P Complete 8mm Reinforced Gear Box for M4 M16 Airsoft AEG (Configuration: i5 Rear Wired V2 / Standard Deans / Full Auto), Accessories & Parts, AEG Internal Parts, Gearbox, Version 2 Gearboxes -
CYMA Sport Complete Ver III Gearbox w/ High Torque Motor for AK Series Airsoft AEG (Type: Rear Wired), Accessories & Parts, AEG Internal Parts, Gearbox, Version 3 Gearboxes - Evike.com Airsoft Superstore
Gearbox Installation Kit (GIK) - All AEG Gearbox Versions – Airtech Studios