Huben Gk1 air dump

The first and only time I had mine out shooting, I had it dump all the air out shortly after refilling. Searched AGN and found the remedy is actually in the owners manual, page 7 #2, disassemble the receiver back plate take out striker spring and buffer. Push down the striker to reset, then reassemble. Refilled and it held air, haven’t shot it since but it is holding air. Hope this helps
 
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