150% hammer spring was made by high strength spring steel which is able to increase the power for each valve punch. It is suitable and more reliable in hot weather environment or high pressure condition to ensure a consistent valve movement in every shot. Compatible to TM M&P9, M&P9 V Custom and M&P9L.

COWCOW Technology Spring Steel 150% Hammer Spring for Tokyo Marui M&P9 GBB
Made from High Strength Spring Steel
Hard Coating Prevents Corrosion
Provide extra hammer power
Workable even in extreme weather or high pressure environment
Suitable For Tokyo Marui M&P9 Series Airsoft Gas Blow Back GBB Pistol