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
One AK model was also seen in the trailer, it definitely had a 7.62 magazine, but nothing else in the video is clear. The GameTrailers Analysis states that it is an AK-103 but this is unconfirmed.
Maadi ARM - most of the AKMs seen in movies during the 1980s were imported ARMs that were legally converted to full auto fire. This image is of an actual movie gun. The laminated buttstock was replaced with a hardwood one when the original stock was broken during a stunt. This example is also loaded with a 30-round bakelite plastic magazine - 7.62x39mm
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.