G&G blowback Gearbox V2 Case only

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G&G Reinforced 8mm Gearbox Shell for M4 / M16 Series Airsoft AEG Rifles (Blow Back Type)

This is the G&G electric blowback gear box shell only.

*Fine Tuning May be required for best performance. Upgraded gear boxes will require self tuning just like any other gear boxes.