I actually did have this problem in the way I was told to solve it was exactly what you figured out I was told to instead of slow filling the gun with the empty tank I had to replace the O-ring so I had to bring the tank down to zero instead of starting off slow I needed to really slam the air into there to get it to seat when the tank was empty I needed to give it a large burst of here real quick and then slow down after I reached up over a hundred 50 lb
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