The parts on the trigger bar that ride on the firing pin block, firing pin cruciform, and connector are the edges of a stamp cut piece.
I've trued them up with a fine stone, but you have to be very careful to not change the angle/engagement of the back where it rides on the firing pin. If they're already fair, a polish will help.
The last two trigger bars I messed with were not sufficiently hard to keep from deforming where the firing pon block rides.
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