Deep Fire 7mm Gear Box V2 (w/ bearing)

Deep Fire 7mm Gear Box V2 (w/ bearing) 7mm Bearing Enhanced Gearbox Anti-Heat & Anti-Wearing Construction Suitable for Airsoft Electric Gun AEG Rifle (7mm Bearing, Version 2 Gearbox) As always, upgrading AEG require necessary skill & technique to dissemble the gearbox, consult expertise if needed