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what are you trying to do with the hex key? open the gun or open the gearbox?
Cause you don't need a hex key from the 3 p90s I've owned. You take the butt plate off, you use a phillips screw driver and take the gearbox retaining plate off, you pull the gearbox out.
The trigger on p90s is finicky. A loss of semi auto could mean the first set of trigger contacts are burned/worn and it requires a pull all the way back to the second full auto contacts.
With semi selected, but firing full auto, the cutoff lever could be worn or the semi trigger prongs are too tight, causing the trigger shuttle to get stuck when the cutoff lever tries to hit it to reset it. Or the return spring on the shuttle could be broken or not functioning.
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