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Dale, I would contact Nordic Comp. You may have to take a few measurements of your tube threads but they are very helpful with tube extensions : https://nordiccomp.com/products-home/

you can use a benelli mag extension https://www.bing.com/videos/search?q=DICKINSON+COMMAMDO+mag+tube+extension&docid=608039559633859893&mid=F78A41D41B768023267AF78A41D41B768023267A&view=detail&FORM=VIRE&adlt=strict