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Thanks gents. As I remember there were some discussions here a few years ago on a Parker 20-bore that MIGHT have been cut to Cyl & Cyl and what its choke constrictions were. Right barrel on this one has .003" constriction that's tapered over a 2-inch run. Left barrel is 16 thou over 3-inches. Both with a Stan Baker bore mike that's pretty accurate. JFI.
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