needs to be cut into the main brass part of the valve. The o ring that seals the incoming side of the valve takes care of any leakage on that side of the port hole, you have to add a groove on the other side of the port hole. That will take care of the momentary blast leakage that you get when you shoot the gun.
Your gun is shooting way too slow, shortening the striker stroke can steal quite a bit of power, also I saw a post somewhere that stated that the T port leakage costs 50fps.
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