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You have a large air leak somewhere.
Most likely between your nozzle and hop-up rubber.
With the nozzle in the most forward position, install the barrel against the mechbox, shine a light into the feed tube, observe the muzzle. If you see light, then you have an air leak.
Hop rubbers need to work well with hop units to present the correct profile for the nozzle to mate and form a seal. Certain rubbers "prefer" certain hop units, and also, prefer particular nozzles.
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The Steve has spoken.
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