Spring Prometheus MS120 AEG Emerald

Looking for a spring that spares your gearbox? The Prometheus MS120 AEG Emerald is what Prometheus calls a non-linear spring: a progressive example that is built from coils with varying distances. At the places where the coils are close together, the resistance is lower than with the coils that are spaced further apart. The result? The teeth of the piston and gearbox take significantly less strain and have to absorb a much lighter impact.

In the beginning the load remains modest. As the tightly packed coils come together, the stiffer coils with more mutual space take over. Only in the final part of the compression does the pressure build up as it would over the entire stroke with a linear spring.

That the lifespan of the internal parts of your airsoft replica improves significantly is one plus point. Besides, a powerful motor with this spring can generate good momentum for a quick final compression — immediately the heaviest part — which benefits your rate of fire. For those who want to tune their AEG without overloading the gearbox, a sensible choice.