Adding to Larry's post, from the muzzles back to nearly 6" is considered to be the length of choke in a Parker of that vintage. Further, the section of barrels from the chambers forward about 10" is the section that receives the highest pressure stresses. The section of barrels between the choke and breech sections mentioned is the section that receives the least amount of stress due to pressure but, as Bruce says, still needs to be at least .025" thick.
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