Caught an episode of "Truth, Duty, Valour" last night on the TV. The episode dealt with the next contingent of RCR that will be deploying to Afghanistan this August and showed the urban combat training . Not once did they show anybody using a pistol while searching the buildings, just carbines and in one case a shotgun. I'm sure there
would be situations where having a pistol would be more advantageous than using a rifle (e.g. engineer preparing demolitions, climbing through windows, searching confined spaces, etc).
As an aside, I found the training and equipment depicted used very interesting, especially when I compared to the urban warfare training I had been taught back in the late '70s. Love the look of those sci-fi helmets they used when training with the paint ball guns!