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David, I am not aware of a rifled barrel for the M4 H20 so I would place an inquiry directly with Benelli USA here : https://www.benelliusa.com/support/contact-us

Id try contacting MCGowan Custom Barrels, they can build you a barrel for pretty much whatever you want. https://mcgowenbarrel.com/ ------------- Call Us Today! 406-755-4907 | 4051 US Hwy 93 South, Kalispell MT 59901|admin@mcgowenbarrel.com