For A&K / Classic Army M249 Series Airsoft AEG 

CNC aluminium gearbox for M249. Made of aluminium 7075. Beautiful looks, high precision, high intensity.

Complete pre-assembled gearbox is a good alternative for those who want a complex upgrade your weapons. Without having to fight the compatibility of internal parts, assebly and shimming. 

But as ussual, requires advanced knowledge of the function of airsoft guns.