The DMW Benelli magazine extension tube increases the capacity of Your M4 shotgun by two rounds. The Tube is made from Carbon Steel and has a Black Oxide finished. Kit includes the tube and correct length spring: everything necessary to convert your M4 to 7+1 Capacity. Proudly Made in the USA by Dave’s Metal Works
Note: The DMW 2 round tube extension is designed for the Benelli M4 semi-auto shotgun ONLY. This extension kit WILL NOT WORK with the Panzer Arms M4 Tactical, SDS Radikal SAX2, Toros Copolla T-4 shotguns or any other semi-auto shotgun based on the Benelli M4 configuration.