the mp5k has a silencer with a barrel inside, the whole thing should be around 30 cm.
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Jimski, may I ask how many guns you've upgraded before?
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You may: I've upgraded those guns with different configuration, less or more powerful, and never experienced anything that problematic.They all worked perfectly at one point...
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are you putting the tappet plate on the nozzle correctly?
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I think so.it's hooked together.
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Tested that the piston moves freely on the piston rails?
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yes.
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Done a compression test with your finger like others have mentioned?
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yep! it was convincing at the time.
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Check the Guarder cylinder head as well, they were defective a while back and you had to build up material under the o-rings to make them seal properly
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ahhh that's interesting thanks