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1. When the gears aren't in a good condition anymore. It happens when you hear unusual sound within the gearbox when your AEG (Automatic Electric Gun) is shot. The gear/s probably chipped or worn out. You can change only the broken gear (pinion gear, bevel gear, spur gear, or sector gear) or the whole gear set.

2. When you want to upgrade your AEG to a higher rate of fire (RoF). You can upgrade your gear set (the one comes with your AEG is usually 1:8) to 16:1 or 32:1 gear set.

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13y ago

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