Reply To: Someone please explain :)

Forums PCP Airguns Someone please explain :) Reply To: Someone please explain :)

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bill_dd97
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It’s the bell curve. Unregulated guns on a full fill start low fps, build to a high point, then start dropping. This happens because of the high tank pressure pushing back against the valve stem when the hammer strikes it. As tank pressure lowers, the hammer can open the valve easier. The drop is from the reservoir losing its pressure.