Hey guys! I'v finally decided to build my self a CQB gun since i have a few arenas near me that are CQB and my current m4(stock m4 with few mods) is to powerful for the fields FPS limit. These are the parts i will be upgrading to. Echo 1 high speed gears(13:1). Echo 1 sp90 spring. Lonex m4 air nozzle. Lonex blue piston(will probably swiss cheese it for better speed). SHS high speed motor. NanoFet mosfet unit. Please tell me if i shouldn't use one of these or there is something better out there for about the same cost.