The AirsoftPro M150 upgrade spring is designed for next-generation precision rifles and is made from durable heat-treated spring steel.
Note! Older AirsoftPro springs were significantly overpowered, but the nominal power of newer production batches is closer to reality. A skilled technician can still achieve slightly higher muzzle velocities than the nominal rating with these new springs.
Inner diameter: 9mm
Outer diameter: 13mm
