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MP9 venting issue.

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Hi all.


Recently picked up a KWA MP9.


First day it was running fine, and now when I fire it, it vents slowly after the first shot. 

Please note this is in all 4 magazines, brand new gun and I have tried abbey predator green 144a, nuprol green and nuprol red just to see if it will feed/cycle but to no avail.


Any suggestions?

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either the piston head/nozzel is dried up and needs oil or the nozzle return springs need looking at

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