The spring of an airsoft gun is a fundamental part that affects the overall speed and ROF (cycle rate) of the gun. Additionally, the Prometheus non-linear spring offers the same great performance increase as traditional normal springs, in addition to lower gearbox and motor stress and easier compression.
The nominal spring strength number indicates the expected value in meters per second with ammunition weighing 0.20g.

- Color coded for easy identification of spring rates
- Non-linear, irregular pitch design for less strain on your gearbox
- Special coating to prevent paint peeling
- Precision made in Japan