hatsan novastar 6,35

hello...i have this gun for two years now and i had some problems wit it but nothin big..this part was broken so i ordered new..i changed it and it worked fine but now i have problems that i dont now how to fix...when i fire it shoot couple times in one pull of the triger...very fast 20-30 times in one go...did someon have same problem...what can i look
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