Prometheus MS150 Non-Linear Airsoft Spring

Excellently crafted spring with the usual outstanding Prometheus quality, in a non-linear design for optimal performance and durability. The nominal strength of the spring specifies the expected value in m/s (meters per second) with 0.20g heavy ammunition and can be multiplied by a factor of 3.28 to reach the value in fps. The specified nominal value is only a guide; the effective muzzle velocity depends on the tuner's skills and the system's sealing. With correct installation, the effective value typically deviates by less than 10% from the nominal value. Experience shows that the effective value is usually higher than the nominal value, so in case of doubt, always opt for the next weaker spring. To achieve the desired muzzle velocity as optimally as possible, various components and combinations (springs, piston head, cylinder head etc.) often need to be tested. For systems with particularly good sealing (e.g., KWA G2X), significantly lower nominal values must be chosen.