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I touch the broken face with an end cutting mill to create a flat spot as close to the center as possible, then carefully center punch dead on (transfer punch) and drill out with a left hand bit.
A firearm is far from the most expensive thing I have removed a broken fastener from.
I have a set (number, letter, and a few larger) of solid carbide left handed bits.
They are short and as hard as you would expect.
No idea if they are even made anymore.
EDM works well, but the equipment is very expensive.
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