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Yes these are 2¾" shells, and will fit the Mossberg 590M Magazines with no issues as that is what it is designed towork with. From Mossbergs site. "For shooting flexibility, 590M magazines are available in 5, 10, 15, and 20-Round, and are for use with 2.75" shotshells." Full specs here https://www.mossberg.com/category/series/590m-mag-fed/

Brian, if it is 12 gauge and 2 3/4" it should fit & function just fine. Have a great day!