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Norman, the 320 uses standard Winchoke configuration. It is not threaded for Invector Plus chokes, so these will not work. You can use choke tubes with Winchester, Browning Invector & Mossberg 500 style threads. Stay safe & have a great day!

Hi Norman and welcome to the Buds Community. You will need the Win Chokes - Modified = https://www.budsgunshop.com/product_info.php/products_id/723002684/carlsons+winchester+flush+choke+tube+12+gauge+modified ------------------------------------ Full = https://www.budsgunshop.com/product_info.php/products_id/723002687/carlsons+winchester+flush+choke+tube+12+gauge+extra+full - Cheers and stay safe!