what you describing sounds like the air nozzle and the rubber are not making proper seal. maybe the rubber is a millimeter too far on hop up unit 2 for air nozzle to make a seal.
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Current Arsenal:
AW Hi-Capa 5.1 X 2
EMG DD MK18 Cerakote
VFC M4 MK18
CYMA AK47
TM MP5 First gen  Rare find
TM MP5A5 with swordfish 2004
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