The Nautilus gearbox includes the anti-corrosive coating that give the gearbox it's unique color and the wire keep for the motor wires around the base of the gearbox. Each component on the KRYTAC Nautilus V2 Gearbox has been designed to perform at a high level and to be user friendly for the technician that repeatedly tunes their AEG. This is the standard gearbox shell for the KRYTAC Trident series of AEGs but it can also serve as a replacement or upgrade to other AEG platforms.