MW2 isnt going to be as good as you all expect it..
Why?
•No dedicated servers
•No mods
•Pay for downloadable content
•Cant buy servers
•Like 360/PS3 search for games

Guns for MW2:
Assault Rifles
- FAMAS
- ACR
- M16
- AK-47
- AUG HBAR
- IMBEL MD3
- FN 2000

Sniper Rifles
- SVD Dragunov

Sub-Machine Guns
- FN P90
- UMP .45
- TDI Kriss
- H&K MP5

Shotguns
- SPAS-12
- W1200
- Striker 12 Guage

Light/Heavy Machine Guns
- RPD
- MK46

Pistols
- USP .45
- Glock 18/22
- M1911 .45
- Desert Eagle or Baby Eagle

Melee
- Combat Knife

Explosives/Grenades
- C4
- Frag Grenade
- Stun Grenade
- Smoke Grenade
Gun Attatchments
- Red Dot Sight
- Heartbeat Sensor
- ACOG
- Silencer
- 203 Launcher
- Master Key

Grenade Launchers
- GP-25 Grenade Launcher
- M203 Grenade Launcher

Armor
- Riot Shield

As found on: http://mavrick.id.au/call-of-duty/2009/modern-warfare-2-weapons-list/