The gearbox is the case that holds all the vital parts of your gun together that allow it to shoot. This is a precision machined gearbox from a well known manufacturer of high quality airsoft goods. The high quality materials and precision machining are ideal for better shimmed gears and overall better gun performance. Many clone AEG gearboxes are made with poor quality metal and are not precision machined like this G&P, it is highly recommended that the gear box shell be changed out in those type of guns.
This is a blowout item. There are NO Refund or Exchanges for this product.