Briley's in Houston can insert a fixed or removable choke tube, provided there is sufficient wall thickness. There is also something called a jug choke in which the bore before the end is increased then narrowed at the end, also depending on wall thickness, but I doubt there would be enough to get you to .020 to .030" constriction. It may be just me, but I've never liked the idea of reducing wall thickness, and I have seen screw in choke tubes blow out.
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