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Uzi, MP5 have both seemed to work real well over the years for close quarters.
So now you make a 9mm with a 4.5 to 6 in barrel with an arm brace or SBR and you have a usable cartridge/package compared to a 7.5 barrel AR in 5.56 with a huge ball of flame from un-burnt powder to let everybody know where you are.
With good hallow points there is better expansion and less blow through compared to 5.56 taking out an innocent and it is easier to control than a handgun.
Just my opinion
The increased velocity of a rifle barrel puts 9x19 squarely in .357magnum territory. I am sure all those poor saps who use an mp5 are horribly undergunned as well. For me, the issue is distance and maneuverability. I hear people speak of 9mm as much less capable than it is. I ring steel with my carbines at 200 yards. however, if a stray bullet were to collide with my roof, given some tests I have done with my roof`s materials a 9mm would blast the roofing tile, but it does stop it, minimizing stray bullets. I used the same plywood and tile from my roof for testing purposes.
However, I am leaning towards 9mm carbines for the stray bullet factor. Given the way my home is built and angles, risk of collateral damage is low. To me living another day and not killing an innocent are my top priorities. I also highly doubt I would have 100 percent accuracy in such a case.
One of the reasons HRT, SWAT (insert acronym) teams have moved away from the MP5 & Uzi sub-guns is for less penetrate concerns of .223/5.56 when compared to 9mm. They are not using bullets M855.