Hello, I have a KMP9 and sometimes it will not fire. In semi, sometimes it works, other times it will not fire until I pull the handle again. Also, full auto just stops at random spots. This issue is also described in http://kwausa.com/fo...?showtopic=4080
and someone mentioned this in that thread....
We may have found the culprit. The entire motion is connected to the bolt so it seems like the bolt is caught on the catch and stopping it go forward. However, after close examination looks like Part #162 a spring that holding on to the part #153 disconnect is a tad bit too strong and pulling the disconnect back. If it's not fully forward, it will not release the hammer to fire. We have modified the spring and fire the gun at least 3000 rounds (and counting) with air compressor adapter. So far the problem guns hasn't comeback. We'll continue to keep you guys posted.
Anyone have any other details about this spring and what was done to it?