I have a real doubt about the Thompson. The rear sights are 1928 model, but the barrels are M1 model. If someone have the good answer.
As production ramped up for WWII, Auto-Ordnance did make a few batches of 1928's known as the M1928A1 with a lot of the simplifications that'd be folded into the M1 Thompson's. Including the smooth barrel. Since it's got the top mounted charging handle it's safe to assume it's a M1928A1. --PaperCake 11:01, December 5 2021 (EST)