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Hi Thomas and welcome. No, Mossberg says it Fits: Mossberg 500 and 590 12-gauge shotguns. You will need this one for the 20ga : https://www.budsgunshop.com/product_info.php/products_id/58514/mossberg+pistol+grip+for+20+ga+model+500+505+w+quick+detach - Cheers and stay safe!

For a 20 gauge Maverick, this is the grip you want to use. https://www.budsgunshop.com/product_info.php/products_id/58514/mossberg+pistol+grip+for+20+ga+model+500+505+w+quick+detach

Thomas, no sir, this is for 12 gauge only. You want this one https://www.budsgunshop.com/product_info.php/products_id/58514/mossberg+pistol+grip+for+20+ga+model+500+505+w+quick+detach , Stay safe & have a great day!