Wii Tech M4 TM 160% Nozzle Return Spring (Part No.121,122)
The force of this spring is about 160% of the force of original T.Marui spring. It also has a rubber pipe inside the spring. The stainless steel wire avoids oxidation inside the nozzle. This 160% spring is good enough to pulls the nozzle back into bolt-carrier faster after BB has left the barrel. Therefore, this spring enhances better recoil action and minimise jamming BB during loading. It also does not interfere the shooting power.