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You will have to inspect the washer mounting system, if it is just a small shelf in a long tube boring it out will mean you have no buffer tube retention system.
Boring it out could theoretically be done with a drill, but you'd risk drilling sideways and destroying the whole thing. You'd need a milling machine. Unless you happen to be a machinist (then you wouldn't be asking this question), getting someone else to do it will cost you miles more than buying a new buffer tube including shipping.
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