Pistol Leaks CO2

Also, the valve stem o-ring { piercing stem} could be bad, it's pretty hard to tell if it is bad. Can get part # from Crosman schematic. Also check E-Bay. several vendors.sell parts. Names don't come to mind right now, but one is in GA. one in Minn. Have what you need. If leaking from the barrel or out the breech, there is your problem.{ but not a whoosh. Best bet as per Cfidave it is the the valve seal {orange }. Best bet is getting that part from Crosman as they sell retail for about six bucks. Can get them from Crosman for half that price. Suggest you get several as they go bad pretty fast. Also keep the seal lubricated with Pellgun oil.If you can't find that piercing stem, PM me as I have several
 
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