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Hatsan 30 Cal

More than likely (99%) it’s leaking past the o ring in the fill port. You can check this by spraying foam shaving cream in/on the fill port. Watch for bubbles.
If this is the point of the leaking, you will need to do one of two things:

1. remove the fill port from the air tube ONCE THE TUBE IS EMPTY. They are on tight. Don’t even try to attempt to remove with the fill probe. You’ll break it/bend it.

2. Send the air tube to Hatsan and have them repair it.