It is the "organ" I guess you could call it, that makes the airsoft gun work. Inside, there are many parts:
- Cylinder
- Cylinder head
- Piston (and piston head)
- Spring
- Spring guide
- Tappet plate
- Air nozzle
- 3 gears (sector, spur, and bevel)
- Anti-reversal latch
- Trigger assembly
- Wires to battery
- Wires to motor
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A gearbox in an airsoft gun is basically what propels the bb's out of the gun. A series of gears spin and push a piston into a cylinder. Because the piston fits very tightly inside the cylinder, the air that was inside the cylinder has to be pushed out, so it's pushed out the other end where the BB is and this pushes the BB out of the gun.