Want to have your version 2 gearbox powered airsoft gun to go to the next level but on a budget? You can try this 9mm complete gearbox which is available at Airsoft Panda for US$50.00. This reinforced gearbox 2x 9mm ball bearings and 4x metal bushings and is an easy powered Upgrade System. Made in China, so if you get one and have tried it out on the field, we would be happy to hear a report from you with regards to performance and reliability.