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A smith with a mill and a rotary indexing dividing head can port it. Don't use that hand-drill porting jig from Brownell's. The original design was good but when Brownell's subcontracted out production, the manufacturer got lazy and instead of making all the holes perpendicular to the centerline of the bore, drilled them out at the same angle. The appearance is funny with some holes appearing oblong. The best way to do it is to use a milling machine with the rotary indexing dividing head. Perfect every time.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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