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That usually means you're not forcing the cupseal open far enough for blowback gases to get through the little port under the plate on the side, so it isn't making recock. Sounds more like the valve spring that time, unless the seal under that little plate on the side is leaking? This does the blowback. That spring between the cupseal and the back of the pierce pin ONLY needs to be strong enough to barely hold the cupseal against the face of the valve, if you can air the gun up without having the bolt locked open, then it's definitely too strong.
Rob
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