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Apparently a few tommy guns were chambered for .38 Super..as well as Ingram Model 6s.... good question. The case is only a little bit longer than a normal 9mm Parabellum, right? Might be interesting to see someone ream out a 10-14" AR9 barrel for the .38 Super +P and then do a little work...use 1911 magazine type... see how hot and how good it does ballistically?IIRC, the .38 Super was prominent because of some super-hot handloads--though the basic original spec was hot enough to punch through a steel "Detroit Dinosaur" car door, hence its popularity in Prohibition-era gangster circles. Hmmm... I wonder what a .38 Super TSMG would do?