Tom, if you have The Parker Story, there is explanation there about some of these 3" 20's from the Widgeon Duck Club and other California Inland Valley clubs. These are sought after guns, and condition varies widely. Some are identified by SN in TPS. If you don't have TPS, and need help, please advise. Everything I know about them is from TPS. I do know that there are a bunch of aftermarket lengthened chamber ones out there.
I suggest you contact Chuck Bishop and get a letter on the gun, if correct, the letter should tell about chambering.
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