You wrote “M1A1 is faster to reload than M1928A1”, but that is not the case. The M1A1 has a stock 3.0 second reload. The M1928A1Thompson has a stock 2.3 second reload. In what universe is 3 seconds faster than 2.3 seconds?!
Same with the ROF. according to your description the M1A1 Thompson has a “slightly higher rate of fire” then the M1928A1 Thompson. Also here the question: in what universe is 600 higher then 700?!
So your description is completely wrong!
Either you change the reload time and the ROF of both, or you adjust the description.