M100 main
spring

The main spring is designed to be
used in tune ups of the electric replicas (AEGs), the spring is uneven, what
significantly extends the lifespan of the system  by minimizing the
spring”s clumping effect, of course under the condition that the spring is
mounted in a proper manner. It is made by the well known G&G company.

In a
typical system, the spring allows to fire the BB pellet with the muzzle
velocity of about ~330 FPS. Yet it is important to remember that the final
muzzle velocity gained by the mount of the spring depends on the sealness of
the system, the type of the used cylinder, the length of the barrel and its
diameter. The ends of the spring were grinded what results in its better
operation