CowCow Nozzle Valve Spring For Tokyo Marui Hi-Capa

- CCT Nozzle Valve Spring constructed with high strength spring steel and hard coating to enhance it durability and stability. 2 different lengths of spring option lets professional user able to equip the proper one to optimize the performance. White Blue Spring is pre-set as balance on Joule power and recoil. Black spring is around 10% increment on Joule power. - NOTE: As always, upgrading GBB require necessary skill & technique, consult expertise if needed