Bravo Airsoft Complete Gearbox for M4 style airsoft guns.  This complete reinforced gearbox is build with all of Bravo's high-grade internals to ensure quality and durability.

*This gearbox may be compatible with other AEG's that have Version 2 gearboxes, however the gearbox may need to be rewired to the rear.  Please know that changing the wiring or modifying the gearbox in any other way will void your warranty.