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The you turn the striker guide rod with a slotted screw driver. I think mine might be screwed up, I barely get a 1/4 turn out of it. Supposedly you can turn it a couple times in one direction or the other.
Anyways, what you are doing is adjusting the pre-loading of the striker spring, which determines the force and travel distance the striker hits the release valve to psuh the BB. More gas, higher frps. Less gas allowed out, the lower the fps.
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