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Hi Morgan and welcome. Magpul says this fits the 12ga models Sir. https://magpul.com/sgastock-mossberg500-590-590a1.html?mp_global_color=118 - I would confirm with Magpul Customer Service at 877-462-4785 or by online inquiry here : https://magpul.com/about-magpul/contact-us - Cheers and stay safe!

no the 20 ga has a smaller frame where the stock connects

Morgan, no, this is for 12 gauge models. stay safe & have a great day!