Tuning Vulcan 3 fill issue

So I found the problem; there is a flathead countersunk screw and o-ring inside the fill block at the end of the air tube. The screw and o-ring are behind the tiny hole inside the fill port. The screw was loose and was cock-eyed. I tightened it down, reassembled everything, and now the air stays in the rifle after bleeding off.

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Just saw this reply. I’ll have to try that and see if it works. I have to find that screw you are talking about. 👍🏻
 
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