The spring of an airsoft gun is a fundamental part that affects the overall velocity and ROF (cycle rate) of the gun. In addition, Prometheus' non-linear spring offers the same large performance gain as traditional regular springs, in addition to less stress on the gearbox and motor, and easier compression.

The nominal number of the spring strength quantifies the expected value in meters per second with 0.20g heavy ammunition.

- Color coded for easy identification of spring rates

- Non-linear, irregular pitch design for less stress on your transmission

- Special coating to prevent paint peeling

- Precision made in Japan