I'm having an issue with my benjamin hand pump . I recently changed a damaged o-ring on the pump. I used the pump today and got my marauder to 2900 psi with no problems but when I bleed the valve on the pump all the air escapes and leaves the gun with under 2000 psi . A couple hours later I try it again and same thing happens I get it to 2900 and when I bleed the valve all the air escapes . What did I do wrong when I rebuilt the pump? I really want to shoot today
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