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Best approach to cutting thin, deep slots in 6al4v?

You don't have to have it all the same width either; the part under the handle scale could be wider than the part in the bolster.
Just to take this one step further, you could cut it wide from the back side and under the handle scale, then just cut it narrow for the breakthrough on the front-side of the bolster, and maybe full depth where it breaks out the side.