The following guns will be used in the video game Modern Warfare 2 (Call of Duty)
Steyr AUG - Austrian Army Version 5.56mm
Russian ultra-nationalist with a AUG A2.
FAMAS 5.56mm Assault Rifle. Standard service rifle of the French Forces.
Russian ultra-nationalist with a FA-MAS assault rifle.
Colt M4A1 Carbine with 4 position collapsible stock 5.56x45mm
SVD Dragunov sniper rifle - 7.6x54mm R
Brazilian militia with a SVD sniper rifle.
RPD Light Machine Gun - 7.62x39mm
Springfield Armory Pro Tactical, this is an airsoft replica of the real model ( note, this is the Western Arms Marine SOC plus it says it is a Kimber)
Captain "Soap" MacTavish climbing up the ice with a 1911 pistol. He also have a rifle on his back (probably a suppressed M14 but not confirmed).
The GameTrailers Analysis states that it is a Glock 22, but this is unconfirmed.