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Hi Randy and welcome. No Sir. Only the A1 590 Models have the "Heavy Walled" Barrel. Cheers, stay safe and enjoy!

Hi Randy, no sir, the barrel is a normal diameter and not a heavy-walled variant. The 590A1 Retrograde has a heavy walled barrel https://www.budsgunshop.com/product_info.php/products_id/109204/mossberg+%26+sons+590a1+retro+12+ga+9rd+20 , Stay safe & have a great day!

No, it does not. Now, the 590A1 is the model that sports the thick walled barrel.

it is not a heavy barrel