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SGN and Vollmer do not have the tube. the hk part number for the sub calibre tube is :203 928. i am personal friends with jesse briley and thought of trying to get him to make one from a rifle blank but, he's not interested, my father-in-law is a tool and die maker and he won't touch it because it is for a machine gun. there must be someone with one or knows how to get one or knows who would make one.
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