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KAk industry used to make one but they no longer sell it. https://youtu.be/nz1qTJ6j7N4

Looks like you can also use a mossberg 500A magtube https://www.survivalistboards.com/threads/rock-island-armory-m5-magazine-extension.961985/

Lance, I would start with Rock Island Armory in case they have an extended tube available at Phone: (775) 537-1444