Originally Posted by
emin-j
Sounds to me like the valve is sticking and suddenly ' letting go ' when the valve is unscrewed to a high flow rate level, I have the mde valve on my bottle and don't consider it a quality item, I open the valve slowly then there is a point where the air will barely start to flow then without unscrewing anymore the airflow will suddenly increase to the point the valve in the gun will 'click', at that point I have to turn the air pressure valve down to restrict the airflow I can then adjust the gauge to give a slow fill.
It reads worse than it actually is, I've got used to the method now.