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

The nominal number of the 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