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air was leaking from the hop up rubber.. so i used teflon tape to seal it and my FPS went straight up. however, this only worked for my longer barrel KM 6.0mm 469mm inner barrel. For my prometheus 6.03mm 363mm barrel, FPS remained the same (described several posts above) even with the teflon tape mod. I guess having a longer barrel really increases your fps alot, well at least, in my case it did.
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