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Hi Jack and welcome. Yes but, you will need the OpSol Mini Shell Adapter for 100% reliability here: 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 Jack, it will not function without the OpSol mini shell 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 great day!

I have a 590A1 myself and it will cycle & fire Shorty shells with the use of the Opsol Adapter below. 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