Scot, the closer to 90 degrees the sear engagement is the lower the trigger pull rates. As the engagement angle decreases (becomes more acute) surface area increases, friction increases, and pull rates increase thus causing accelerated wear. In addition there should be NO radius in the corner of the engagement of the sear. A mirror finish on sear and hammer engagements produces smooth trigger pulls. Boxlocks and sidelocks are similar but different, since sears are longer in boxlocks generally. Finally if you don't have the proper tools or are inexperienced leave the damn sears alone.
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