I have had good luck in improving shooter trigger pulls by adding a bit of JB Weld to the top pad of the trigger bar, thus tightening up the tolerance between it and the sear. Add a bead, let it dry then reassemble. If it is too much and the pistol binds, file away a bit of the Weld and keep trying until you get a pull that is acceptable. When you file, make sure to "ramp" the bead from the rear so the sear flows over it when returning to battery.
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