Hokum, the admin of the Ukrainian Airsoft website, Airsoft.ua, sends in an update on his latest review which is about the Retro Arms CNC Gearbox with a comparison with the Army Force gearbox... "Just about 7-8 years ago, they were quite rare. One of the first pioneers was the modular gearbox made by Pro-Win which appeared to be like something from NASA back then (because of the price as well).