Austin manufactured MK1 Sten mag

[browningautorifle]

My original thoughts were that because many of these groups produced exhaust tubing for motor companies, and if you check the thickness you may find similarities... Much like the thickness of the Sten body it's self. I'd think they'd work with material ready available...some exhaust tubing also has rough bead. Yes, the mandrel should smash it a bit though.