As you say, the slack comes from any extra amount of travel between when the trigger actually contacts the disconnector and the rest position...by bending that tab forward(towards the trigger), it moves the rest position of the trigger back. towards the sear disconnector, as that position is determined by where the bow touches the interior of the grip.
It basically is like that screw in the trigger to minimize over travel, that screw is to remove extra travel after when the sear was tripped, by screwing it in you make it stop earlier by letting the screw bottoms on the mag release first...
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