M150 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 150 m/s ( about 500 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.