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Hi Benji and welcome. The shotgun barrel is chambered in 20 gauge. Cheers and stay safe!

This is the 20G model. Specs & info below. https://www.chiappafirearms.com/product/500.183/m6-folding-shotgun-rifle-blued-20ga-22wmr-18-5-bbl

Hi Benji, this model is 20GA / 22 MAG. The 12GA / 22 MAG model is here https://www.budsgunshop.com/product_info.php/products_id/5620/chiappa+firearms+500182+m6+22+mag12+gauge+1+1+18.50+blued+black+skeletonized+w+foam+inserts+stock+modified+choke , Stay safe & have a great day!