"Interesting looking weapon. I would hate to be on the receiving end of that, but it looks far from easy to conceal. Why not a cut down rifle or shotgun? These guys were not overly worried about having illegal weapons.." This was in reference to Baby Face Nelson's fully auto 1911 .38 super.
They weren't illegal until 1934. I'm not sure what dates Nelson was in business.
Cogito, ergo armatum sum