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Listen to the feed port for PBs..... (never the barrel of a charged gun!) If it sounds like the hiss is coming from inside the gun it will either be the O-rings on the valve or the cup seal (more likely). You can get to the cup seal easily by removing the vertical adapter which is the part that the front grip/expansion chamber screws in. Be careful to hold it while removing the screws since it is under spring pressure from the valve spring. Once you take it off you will have access to the valve spring, cupseal, valve pin, and pin stabilizer. replace the white plastic part screwed onto the pin and you should be set. (assuming that the leak is coming down the barrel)
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By the time a man realizes that maybe his father was right, he usually has a son who thinks he's wrong.
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