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What do you mean you're manually manipulating the cutoff lever?
You shouldn't even need to do that if you install the gearbox in the lower receiver of the gun so that the fire selector does that for you... Are you test firing the gearbox inside the receiver or outside the receiver? The v3 gearbox cage doesn't need the receiver to shoot but for troubleshooting the firing issues I would put it in the receiver to make sure it's an actual problem rather than the selector plate moving back to safe after you shoot... Which is normal...
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