If anyone out there, could tell me how to make a 400 or more fps, maybe 18+rate of fire(cause i'm a man!!), gearbox. i have a FS-51 From G&G, it take long Motor, no idea whats in the GB(gearbox) now, not tech smart yet. and i know it take large battery. so if u could give me a line up of items i should use to make a new GB, ill keep my 350fps, and just have a stronger more Manly one. bought from AirsoftGI.