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Hi Joseph, I'm not aware of any 20 gauge mini shells, but if you find some, they will not cycle reliably. There is no adapter for the 20 gauge model. The 12 gauge model will cycle min shells with the OpSol adapter https://www.budsgunshop.com/product_info.php/products_id/36595/opsol+texas+mini-clip+mossberg+500+590+maverick+88+polymer+black+miniclip , Stay safe & have a great day!

Ed C aguila makes 20 ga mini shells https://www.aguilaammo.com/products/20-ga-minishell-4-b they work in some mossbergs but there is no way to know without trying them in your INDIVIDUAL gun opsol does not make a adapter for the 20 Ga

Hi Joseph and welcome. Not reliably since there is no 20ga adapter, only 12ga. https://www.youtube.com/watch?v=QLAb0XFKz7E ------------ Cheers, stay safe and enjoy!