[RKV]

I expect what happened is that they ran out of 5.56mm or had a jam and "went to gun" with the pistol. I agree that a sub-gun would be useful, maybe an Uzi in .45 if you needed a sidearm/backup as opposed to a pistol.

[Dead Dog]

HK MP-10 10mm MP5 varient. The power of a .357 magnum with the recoil of a .45ACP. The Glock Model 20 in 10mm is a delightful handgun, this MP would simply rock.