What's wrong with COD? COD4 was probably the best game of 2007 (besides Super Mario Galaxy). Anyways, here are 3 weapons I want to see:
http://www.cowanauctions.com/itemImages/tee4796.jpg, which takes .22LR ammo.
A http://en.wikipedia.org/wiki/File:Volcanic.JPG, which I hope would be more palatable to the devs then a Desert Eagle.
And a http://en.wikipedia.org/wiki/Webley-Fosbery_Automatic_Revolver, because it sounds awesome.
As for rifles my 3 are:
The http://en.wikipedia.org/wiki/Colt_Lightning_Carbine. A bit out of place, but I think it could be implemented in as a unique Hunting Shotgun with built-in slugs.
A http://en.wikipedia.org/wiki/Nock_Gun, so I can hunt Deathclaws in style.
And a http://en.wikipedia.org/wiki/Mondragón_rifle because of being sort of close to Mexico.