User blog comment:Callofduty4/Black Ops 2 campaign demo, much info released/@comment-402843-20120523030558/@comment-1726879-20120523053743

We don't really do using new weapons these days, we kind of stick to what we know, but with shinier barrels. The AR-15, British Rifles (SA-80 and it's predecessors) and AK rifles have been around for a long time, more than two decades.

Although I admit I'd like to see some new stuff in there, 13 years is plenty of time to allow some concept artist to draw up a weapon and it to be plausible (so long as there's no lasers)