Action Army Progressive Spring M100

The Action Army Progressive Spring M100 is a spring that replaces the original spring that is standard in your airsoft gun.

Of course, this spring can also serve as down- and/or upgrade for your airsoft gun. We regularly get the question with which spring you can get a certain Joule or FPS value, this is never to be said exactly because it depends on several factors and not only on the spring.
The airseal around the Piston, Pistonhead, Cylinder, Cylinderhead, Nozzle and even if you have a Precision Barrel or not determine in the end together with a new spring, what the final result will be in your Joule or FPS value.

Also we never know what type of spring is standard in a airsoft gun because simply and strangely enough the manufacturers never mention which spring is in the airsoft gun.