The spring of an airsoft gun is a fundamental component that affects the overall speed and ROF (cycle rate) of the gun. Furthermore, the Prometheus nonlinear spring offers the same significant performance improvement as conventional springs, in addition to reduced stress on the gearbox and motor and easier compression.

The nominal spring strength indicates the expected value in meters per second with 0.20g ammunition.

- Color-coded for easy identification of spring rates

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

- Special coating to prevent paint peeling

- Precision made in Japan