Thanks. I knew what mono-blocked barrels are, but didn't know how it applied to this particular shotgun. The "rings" around the barrel resemble those that you see on some mono-blocked barrels. But that sort of decoration is also used sometimes to hide the "seam" created with the sleeving of barrels.
Which leaves me still not knowing if these decorative engraved circles reflect a sleeving operation on the gun or are just decorative.
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