RetroArms, the Czech airsoft company, sent in news about their updated gearbox shell. The RetroArms CNC Airsoft Gearbox V2.2 is still made of precision machined EN AW 7075 T651 aluminum with a quick change spring guide system and a durable anodized finish. At the base of the gearbox are deep wire channels for you to guide your AEG wires along the gearbox.