Thompson M1A1 useless compensator
The compensator should decrease the recoil and the butt stock too. The Thompson in BFV looks like the thompson in BF1, but in WW2 it has compensator and butt stock to reduce the recoil. And there...
Forum Discussion
Well, on recoil decrease, it's worth keeping in mind that any visual elements are purely cosmetic in BFV, which is why neither the compensator nor the stock have any impact on it. Specializations are for that. Recoil is high to keep Thompson balanced against other SMGs with lower rate of fire. I agree that it doesn't look like M1928A1 in particular though (it resembles M1A1 instead).
