Stock springs generally tend to be low quality. As the coils continuously expand and contract they loose elasticity and wear down relatively quickly. As a result, your muzzle velocity and overall performance will suffer. The Lonex M100 Enhanced Gearbox Spring uses non-linear steel that resists operational wear and retains elasticity for a much longer period of time
The design of this gearbox spring also helps to minimize unnecessary stress on the battery and stabilize the muzzle velocity generated by your gearbox. 

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