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Hi, This magazine will not work on 870 DM and will only work on AR12 and MKA 1919. The 870 DM's magazine is a proprietary design made by Remington. From what I know, there is no drum mag for 870 DM yet. I hope this helps.

David, unfortunately no Sir. It uses proprietary magazines and currently no aftermarket company has made compatible magazines or drums. -- https://www.gunsweek.com/en/shotguns/shot-show/remington-870-dm

David, No this Pro Mag magazine will not fit. Need proprietary Remington magazine.