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I am having a similar issue with my hop on my KWA MP7, and if I'm not mistaken its a sign that the hop-up rubber has become swollen due excess oil being adsorbed into it (apparently these things are like sponges for any type of oil) 2 thinks you can do is take it all apart, and replace the rubber, or take it all apart soak it water and small qty of mild soap, let it dry then put it all back together again.
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