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It would probably be easier and cheaper to buy the proper sight.
But if you are going to do it, use a smooth cut file to minimize finishing work and to not go too far too fast. Do the math to figure out how much material you need to remove then lay it out on the work piece with a dial or digital caliper. Alternatively you could measure the dimension from the top of the sight post to the bottom of the dust cover and just check as you go with a caliper or micrometer until you reach your number.
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