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Hi David, Night Stick says it Fits: Mossberg 500, 590, 590A1, Shockwave. It should fit the newer 590M but I would confirm with NightStick Customer Service at 469-326-9400 or by online inquiry here : https://www.nightstick.com/pages/contact-us --------- Cheers and stay safe!

David, no sir, The Nightstick SFL-11WL will not fit the Mossberg 590M (Magazine Loader) 12 Gauge Shotgun. The box-style magazine blocks the ability for the SFL to fully cycle. Stay safe & have a great day!