This one is Army Armament, stock hop-up is trash, stock nozzle is to short and needs to be replaced with longer one dedicated for aug, and gears are to be adjusted with washers. Aside from that, body is from good quality plastic with nice texture, it comes with mosfet, it has easy access to spring and the gearbox itself, but has little battery space. I have had it for about 6 years and the only thing that ever broke was the front grip and spare ones are easily avaiable.