AnotherOopsie Posted August 30, 2017 Share Posted August 30, 2017 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? Link to comment Share on other sites More sharing options...
alex90 Posted August 31, 2017 Share Posted August 31, 2017 either the piston head/nozzel is dried up and needs oil or the nozzle return springs need looking at Link to comment Share on other sites More sharing options...
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