As with the hop up, your gearbox may occasionally need to be lubricated as well (although given that gearboxes comes from their respective manufacturers packed with industrial-grade grease or white lithium, this type of maintenance rarely needs to be performed. If your gearbox is whining, this may however do the trick). To lubricate the gearbox, the motor will first need to be removed from the airsoft electric gun, and once that task is completed, a small hole in the bottom of the gearbox will be visible by peering into the now-hollow gun handle. Place the tip of the spray tube through the handle and just into the visible gearbox hole, and spray three to four times. Again, leave the AEG upside-down so as to allow the silicon oil to work its way into the airsoft gearbox.
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