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the semi trigger works a lot like v2 and v3 triggers... there's a shuttle that gets pulled into 2 metal prongs to complete the circuit... when the gun cycles, the sector gear has a cam on it that makes the cutoff lever move and tap the shuttle out of the way to break the circuit. Either your cutoff lever is worn out and isn't moving enough (extremely likely since it's the most common thing to die on p90s) or the 2 prongs on your trigger are too close together so they pinch the shuttle too tightly and the lever doesn't have enough force to knock it out of of the trigger to let the spring pull it back to the front.
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