I've got protrusion down to .049 and the firing pin is more square than round. I'm afraid to take off too much at once so I sand a little and shoot before sanding again.
How it came from the factory. I don't remember exactly what I measured, but it was >.065" if I recall correctly.
After the Desh bushed the bolt. .059".
After two sessions with 500 grit sandpaper. .049".
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