![M130 Main Spring M130 Main Spring](https://air.viruisis.lt/4991-large_default/m130-main-spring.jpg)
M130 Main Spring
A steel spring with an unequal stroke designed for power tuning. It provides a muzzle velocity between 420 - 450 FPS (depending on the internal gearbox parts used). The fronts of the spring have been ground, which translates into its better operation.
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