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there is NO selector plate in a P90... what are you talking about??
The semi switch is the one you can see when you have the gun up-side down.
There is the "mechbox trigger" that the rod connected to the real trigger push. On the back of it is a copper plate that is used for auto-full.
If you look just a little further inside the mechbox, you will see 2 copper connectors about 3mm from each other. When you press the trigger halfway, there is a metal tab that goes in between and connects the two, the mechbox cycles and then the sector gear moves some part so that that metal tab is not linked directly to the trigger anymore.
Don't plug in a batter and check that the metal tab connects both pins... if that is a gap, there is your problem.
I had the same problem when I changed the wires from my older P90... just bend the 2 strips to that they are closer to each other.
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