I believe the one she's holding is an M1 version. No compensator, a stick ("Navy") foregrip, and from what I can tell, no ability to accept drum magazines, and the bolt level on the side. That one is strictly a military issue, not like the civilian "Chicago Pianos" favored by the bootleggers and gangsters of the era.
But I might be wrong ...
Mr. IronJack, I don't doubt you a bit. I don't know anything about these particular weapons. This is another one she got to hold. The arms dealer said that it was owned by a Rum runner from Florida who was doing biz out of Cuba?? He claimed that he had all of the providence to prove it. Again.. another @ 35K item.