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I assume that's not the exact set since those are hole saws for ceramics, not metals.
Also, nobody makes a hole saw long enough for what you want to do, but you'd need a 1" holesaw.
If you did managed to find a hole saw close to the right size and long enough, it's going to make a big mess of things, especially if you have a bore just under the size of the holesaw, you'll need to start the hole by boring out the end of the buffer tube to the same size as the holesaw to begin with.
A spade or twist drill would be the best lower cost alternative, but a boring bar is still your best bet.
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