Lies. The weapons in CoD are unrealistic as hell.
And to support this- AA-12 actually has a slower firerate than the USAS-12, it's just that the USAS-12 is quite heavy.
USP
.45 caliber handgun is the same as the P99 and FiveseveN.
The calibers for most of the guns don't even represent the real amount of damage they cause. It's just really effed up. Honestly, I've thought about taking CoD, and building a mod off of it that's better than the crap they sold to the people.