As an acronym for “feet per second”, FPS is a way of determining the speed of the BB bullet when shot out of an Airsoft gun. This app helps you find a proper power spring given a desired FPS level. 3 spring makes are included: PDI, Systema and Guarder.
Android: https://play.google.com/store/apps/details?id=com.airsoftpress.springselector
Windows & iphone: https://fingertainment.itch.io/finding-a-power-spring-for-your-aeg
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