Pie is right, this rework isnt necessary as there are 2 distinct types of Thompson irl:
The one used by soldiers,with high dmg,high recoil and low clip size.
The one used by gangsters:low dmg,low recoil(presumibly) and high clip size.
If this will get into R2DA, it will probably be a separate weapon.
P.S. The one in R2DA is the first one i mentioned.