Gents these are all good points about SMG's and shotguns. In away at least for CQB I don't think either is an issue....penetration either for a SMG or Shotgun isn't anything to worry about. Range isn't an issue either
Its true that Shotguns have as many or more projectiles than an SMG burst but doing a Mad minute with a shotgun is more difficult that with an SMG, not because of speed but recoil, shotguns have a fair amount of recoil...also The reason I mentioned the Pump shotgun is the prevalence of them in a T2k Setting. There are several semi-auto shotguns available as well, but few that use detachable mags though several where developed in the 1980's and 90's. Most of those firearms where never really common and only a few newer box fed semi-auto shotguns Like the Saiga-12 have become common in recent years.
If you look at the shotguns of the U.S military it wasn't until 1998 (realworld) that the US military adopted the Benelli 1014 and while semi auto, is still tube fed. Before that they had a used a huge mixture of pump shotguns from various commercial manufacturers, though in ww2 they did purchase the semi-auto remington model 11 which was a copy of the browning A5.
Maybe this thread should be changed to SMG and Shotguns in CQB
Brother in Arms