The Thompson makes sense, but, I don't believe it has been in theater for many years.
I have a friend who's youngest son was actually on the ground in Bagdad, about a week and a half before we saw G.H.W. Bush light the sky up on the evening news. His story is not a good one, but, I digress. His issue weapon for initial building clearing was a military shotgun. His opinion was that it was a little bit too effective, and lead to loss of life that was unwarranted in the beginning, and that firing a shotgun indoors brings on a whole host of problems specific to that weapon, particularly at night. I'm not positive the results would be much different with the Thompson, at least on the full auto setting.
There, but for the grace of God....
Best,
Ted
