That is a common problem. It stops the trigger from slipping of the block. With it gone, the block tips and slips off the trigger and the gun does not fire.
Get a new gearbox shell or you have to improvise. I have stopped doing that. The proper solution is to get a new gearbox. You could also switch to a mosfet trigger replacement like the ascu, etc. They don't require that part of the casting to operate.
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