Weapon List
This is a list of all weapons that have been identified in official media for Modern Warfare 2. Definite means that it has been seen clearly in an actual screenshot or video.
AK-47 (or some other modernized AK-47 variant, definite, seen with either red dot sight or ACOG, equipped with heavily modified furniture)
Armsel Striker (definite)
Desert Eagle (definite, seen with a laser and/or flashlight attachment)
Dragunov (definite, seen with sniper scope)
FAMAS (definite, seen with red dot sight)
FN F2000 (possibly a different gun, definite)
Glock 22 (or some other Glock variant, definite)
H&K UMP (definite, seen with red dot sight)
IMBEL MD-3 (definite, seen with red dot sight)
Knife (definite, will be used differently to CoD4)
M4 (or some other AR-15 variant with a sliding stock, definite, seen with just a suppressor in one part, ACOG and Grenade Launcher together in another)
M14 (Seen with a new Snow camouflage and a suppressor)
M16 (or some other AR-15 variant with a solid stock, seen on cover art, highly probable, seen with a red dot sight)
M21 (highly probable, seen with sniper scope)
M1911 (definite)
M249 SAW (possibly FN MAG, definite)
M60 (seen in flashback to CoD4 during trailer, highly probable)
MP5K (definite, seen with red dot, can be used while using shield)
Remington 870 (or a very similar shotgun, definite)
Riot Shield (definite, will be a Perk in multiplayer)
RPD (definite)
Steyr AUG (definite, seen with scope)
TDI Vector (definite, seen with no attachment, a Red Dot/Holo Sight and possibly seen with suppressor)