M140 Main Spring
M140 Main Spring
- Weight: 25 g
- Materials: steel
- Manufacturer: SHS
M140 Main Spring
A steel spring with an unequal stroke designed for power tuning. It provides a muzzle velocity between 450 - 480 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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