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Take the barrel group out and try pushing a BB through the hop rubber's seal, should take much more than the weight of a pen to push it through.
Hop should be slightly on
Look down the barrel and check your air nozzle alignment
air nozzle seal test, with the air nozzle fully forward shine a light up the mag well and see if there's any light in the barrel
air nozzle should move freely on the cylinder head, but keep in mind there's an O-ring on it, too
what kinds of BBS?
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