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I've only had problems with the red MadBull buckings, the blue one has worked great.
I'm also using the MadBull Ultimate hop-up chamber and MadBull Black Python V2 barrel and those all work awesome together in my N4.
I've installed the blue and red in TM P90s and had issues with the red but not the blue. If you got the red one that's most likely the problem, if you got the blue it must not be in right...
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