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Hi Clive and welcome. Yes but, you will need the OpSol Shorty Adapter for reliability : 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 --------------- Cheers, stay safe and enjoy!

I also own the 590A1 and yes, it will cycle the minis with the installation of the Opsol mini adapter which I purchased here at Buds. 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