M190 main spring
The main spring designed for power tune up of
electric replicas (AEG) and has got uneven coils that significantly extends the
lifespan of the assembly by minimizing the trashing of the main spring, it is
so under the condition that the spring was properly mounted. The spring is made
by the well-known LCT company.
 
In a typical assembly, the spring along to push
the BB pellets with the muzzle velocity of 190 m/s ( about 630 FPS). Nevertheless,
it is worth mentioning that the final muzzle velocity gained by the mounting of
the spring is depending on the sealing of the whole mechanism, the type of the
used cylinder, the length of the barrel and its diameter.