i found these Winchester model 21 barrels on ebay. Clearly marked "Atlas, Chicago". Most Atlas over unders I have encountered were made by A. Zoli (Antonio?) They may have in fact imported barrels for American guns on order, not sure. I seem to remember Atlas was a machine shop in Chicago, Ithink they stopped gun sales around 1971?. Anyway the choke and rib markings look close to your Parker unknowns
Last edited by Gary Bodrato; 09-25-2019 at 02:02 AM..
Reason: photos not attached
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