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Complete Airsoft AEG Gearboxes offers a wide variety of pre-built airsoft gun gearboxes. Whether you’re looking for an upgraded gearbox or an OEM replacement, we have what you need to keep your gun working in top-notch condition. These gearboxes are already assembled and shimmed, so they’re ready to be dropped in and wired, and then you can fire away. If you have any questions about these complete gearboxes, please contact us.