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Hi Michael and welcome. The 12ga model with the OpSol adapter for 100% operation : https://www.budsgunshop.com/product_info.php/products_id/36595/opsol+texas+miniclip+mini-clip+for+mossberg+500+590+12+gauge+1+round+polymer+black+finish

Hi Michael, the 590S 12 gauge series will cycle the mini shells with no adapter. https://www.budsgunshop.com/product_info.php/products_id/140723/mossberg+%26+sons+51601+590s+shockwave+12+14.375+8+1 , The standard 590 will need the OpSol adapter https://www.budsgunshop.com/product_info.php/products_id/36595/opsol+texas+miniclip+mini-clip+for+mossberg+500+590+12+gauge+1+round+polymer+black+finish , Stay safe & have a great day!

Just an FYI, they only make mini (Shorty) shells for 12G, not 20g. The model you would need to use the Texas Opsol mini shell adapter with to cycle the shorties.
https://www.budsgunshop.com/product_info.php/products_id/109193/mossberg+%26+sons+590+shockwave+12+ga+18.5+bead+sight

below is the adapter

https://www.budsgunshop.com/product_info.php/products_id/36595/opsol+texas+miniclip+mini-clip+for+mossberg+500+590+12+gauge+1+round+polymer+black+finish