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Sound to me like the barrels are sleeved with replacement tubes. Post a picture of the breech end of the tubes. There should be a joint of some sort visable. The fact that the gun was a 0 frame 16 guage originally explains by they went down to a 20g size when sledging. Typically sledging requires the guage to be reduced. Especially if there is not a lot of all thickness. If the gun was a 1 frame, the 16g bore MIGHT have been maintained.
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