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I did replace the leaky exhaust valve and all the o-rings that were in the kit. There is absolutly no leaking of CO2 from around the valve. Tomorrow night I will try to cause a leak by moving the exhaust valve stem around. These guns are actually pretty straight forward in how they...

I have a crosman 150 that would not hold CO2 at all. I carefully installed a rebuild kit and found the exhaust valve to be bad. I used plenty of pelgun lube when reassembling. I fired about 15 shots thru it with no issues. Then it quit shooting pellets. I cock the gun and when I fire it...