Retro Arms triggers are off spec. You can file the back of the trigger that sits on the bottom of the gearbox if you want the trigger to seat further forward, or you can file the top/front if you want the trigger to seat further back.
Just make sure the trigger is stopped by the board and not the switch itself. It is designed like that for a reason, I've seen too many people try to be smart and end up breaking Chimera and Spectre boards.
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